Best Thin Tennis Strings Compared: Poly Control vs Multifilament Feel

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Thin tennis strings can give your racquet a lively response and a precise feel, but the right choice depends on the string material as much as its gauge. Multifilament strings tend to emphasize comfort and power, while polyester options are often chosen for control and spin. The picks below include both types, with their listed gauges and features to help you find a setup that suits your game.

Quick Comparison

Our Picks: Best Thin Tennis Strings reviews

HEAD Velocity MLT: A Lively 17-Gauge Multifilament

HEAD Velocity MLT is a 17-gauge multifilament set made with a multifilament core and thicker surrounding filaments. HEAD describes the construction as supporting energy transfer for a lively response. That makes it a useful option if you want a thin string but prefer a softer-feeling alternative to polyester.

A low-friction coating is designed to help the strings realign after contact. This may appeal to players who want a consistent string bed and spin potential without choosing a shaped poly. The set is 40 feet long, so check your racquet and stringing needs before ordering.

Compared with the polyester picks here, Velocity MLT is the more comfort- and power-oriented choice. Its tradeoff is that a multifilament may not be the best match for players who break strings often or want the firmer, more controlled response they associate with poly.

Pros:

• 17-gauge construction for players seeking a thin string
• Multifilament design with a lively feel
• Low-friction coating is intended to help strings realign
• 40-foot set suits a standard restringing job

Cons:

• May not suit players who prefer a firm polyester response
• Players who frequently break strings may want to compare its durability with poly options

Verdict: Choose HEAD Velocity MLT if you want a thin, lively multifilament rather than a control-focused polyester string.

Solinco Mach-10: A Clearly Specified 1.20 mm Set

Solinco Mach-10 is listed as a 17-gauge string measuring 1.20 mm, supplied in a 40-foot set. That specific diameter makes it straightforward to compare with the other options: it is thinner by the listed measurement than the 1.22 mm Ghost Wire and the 1.24–1.25 mm choices.

The available product details do not specify its construction or describe its playing feel, so it is harder to match to a particular comfort, power, or spin preference based on specifications alone. If you are considering Mach-10, check the current product listing for any additional string or setup information before choosing it.

Its main advantage in this group is the clearly stated 1.20 mm gauge. It may suit a player who already knows they want that thickness, but shoppers who need detailed guidance on material or response will find more information supplied for some of the other picks.

Pros:

• 17 gauge with a stated 1.20 mm diameter
• 40-foot set format
• Easy to compare by listed thickness against the other picks

Cons:

• Available product details do not identify its construction or playing characteristics
• Offers less specification guidance than the other options in this roundup

Verdict: Consider Mach-10 if the 1.20 mm measurement is your priority and you are comfortable checking the listing for further details.

TRU PRO Ghost Wire: A Softer-Feeling 17-Gauge Co-Poly

Ghost Wire is a 17-gauge, 1.22 mm co-polyester string. It is described as a softer option within the co-poly category, combining a more comfortable response with the control and durability associated with poly. Its round, slick surface is also intended to work well as a cross string in a hybrid setup.

This set may be a practical step for a player moving from nylon or multifilament to polyester who wants to start with a softer-feeling option. Its stated tension stability and directional and depth control may also interest experienced players who want a predictable poly setup. The set is white and measures 40 feet.

Ghost Wire is a different kind of choice from Velocity MLT or X-One Biphase: it remains a polyester string, even though its design emphasizes a softer response. Players with arm discomfort should still choose tension and string material carefully rather than assuming any poly will feel comfortable for them.

Pros:

• 17 gauge with a stated 1.22 mm diameter
• Designed to offer a softer response than many co-poly options
• Round, slick surface is suited to hybrid use as a cross string
• Listed features include tension stability and directional control

Cons:

• Still a polyester string, which may not suit players seeking a multifilament feel
• Its 1.22 mm diameter is not the thinnest listed option here

Verdict: Ghost Wire is a strong option to consider if you want thin polyester with a softer design and the flexibility to use it in a hybrid.

Solinco Hyper-G 16L: A Spin-Focused 1.25 mm Poly

Hyper-G is a square-shaped co-polyester string in 16L gauge, measuring 1.25 mm. Its shape and design are aimed at players who want spin and control while hitting with pace. At 1.25 mm, it is thicker than the 1.20 mm Mach-10 and 1.22 mm Ghost Wire, so it is not the thinnest pick in this group.

The product description emphasizes a crisp, medium-firm feel and the ability to hit hard while maintaining control. That profile may suit a player with a fast swing who wants a shaped poly rather than a softer multifilament. Its more assertive feel may be less appealing if your top priority is comfort.

Compared with Ghost Wire, Hyper-G puts more emphasis on its square shape and spin-oriented design. If choosing by diameter alone, it is better treated as a relatively thin option rather than an ultra-thin one.

Pros:

• Square-shaped co-poly construction designed for spin
• 1.25 mm diameter is clearly specified
• Designed for hard hitting with control
• Crisp, medium-firm response may suit players who prefer a direct feel

Cons:

• Thicker than the 1.20 mm and 1.22 mm options listed here
• Medium-firm poly feel may not suit players seeking maximum comfort

Verdict: Choose Hyper-G if spin and controlled, firm feedback matter more to you than selecting the thinnest available diameter.

Tecnifibre X-One Biphase: Thin Fiber Construction for Power and Comfort

Tecnifibre X-One Biphase is a 1.24 mm string supplied as a 12-meter set. Its description highlights Elastyl and H2C fibers for power and tension maintenance, along with a Biphase process intended to improve durability. The listed priorities are power, comfort, and feel.

This is a useful comparison for players who want a relatively thin string but do not want to default to polyester. Its fiber-based construction and stated comfort focus make it a different fit from the firmer, spin-focused Hyper-G. The set length is given in meters rather than feet, so confirm that it is suitable for your racquet and stringing needs.

X-One Biphase is not the smallest-diameter pick in this group, but it offers a clear alternative for players who value comfort and a lively response more than a shaped-poly feel. The product description gives a durability claim for its Biphase process, but actual string life can vary with racquet, tension, and playing style.

Pros:

• 1.24 mm diameter for a relatively thin setup
• Designed around power, comfort, and feel
• Fiber technologies are described as supporting power and tension maintenance
• 12-meter set length is specified

Cons:

• Not as thin by listed diameter as the 1.20 mm or 1.22 mm options
• Set length differs from the 40-foot sets in this roundup

Verdict: X-One Biphase is worth considering if you want a relatively thin, fiber-based string with power and comfort as key priorities.

How to Choose Thin Tennis Strings

Compare the Diameter, Not Just the Gauge Label

Gauge labels are useful for a quick comparison, but listed millimeter measurements make differences easier to see. In this group, Mach-10 is listed at 1.20 mm, Ghost Wire at 1.22 mm, X-One Biphase at 1.24 mm, and Hyper-G at 1.25 mm. HEAD Velocity MLT is identified as 17 gauge, but its supplied description does not give a millimeter measurement. Check the product details and your stringer’s recommendations before treating two gauge labels as identical.

Choose Material for the Feel You Want

String material has a major effect on the feel of a setup. Velocity MLT is explicitly a multifilament, while Ghost Wire and Hyper-G are co-polyester strings. X-One Biphase is described through its fiber construction and is focused on power, comfort, and feel. Mach-10’s supplied product details do not state its construction. If comfort is a priority, compare the material and stated feel carefully rather than choosing only by thinness.

Balance Comfort, Control, and Spin

Thin strings are not automatically the best choice for every player. A soft, lively string may suit someone seeking comfort and power, while a shaped or slick polyester may be more appealing to a player focused on spin or directional control. The right balance depends on your swing, racquet, and preferred feel. If you are unsure, ask a qualified stringer to help match the string and tension to your needs.

Consider String Life and How Often You Restring

A thinner string may not be the best fit if you break strings frequently. String life also depends on string material, tension, racquet pattern, and how you play. The product descriptions identify durability-related features for Ghost Wire and X-One Biphase, but they do not guarantee a particular lifespan for every player. If frequent breakage is a concern, consider whether a slightly thicker option or a hybrid setup makes more sense.

Think About a Hybrid Setup

A hybrid combines two string types in the same racquet, often using one type in the main strings and another in the crosses. Ghost Wire is specifically described as a cross-string option because of its round, slick surface. A hybrid can be a way to adjust the feel of a setup, but the result depends on the two strings and how they are installed. Discuss compatibility and tension with your stringer before changing your setup.

Check Set Length and Stringing Needs

Most of the products here are listed as 40-foot sets, while X-One Biphase is a 12-meter set. Match the set to your racquet and your stringer’s requirements, particularly if your racquet needs extra string for the chosen pattern or setup. Confirm the package contents and the product listing before ordering.

Frequently Asked Questions

What is the thinnest string in this roundup?

Solinco Mach-10 has the smallest listed diameter at 1.20 mm. Ghost Wire is listed at 1.22 mm, X-One Biphase at 1.24 mm, and Hyper-G at 1.25 mm. Velocity MLT is listed as 17 gauge, but no millimeter measurement is provided in the product details here.

Are thinner tennis strings better for spin?

Thinness alone does not determine spin. String shape, surface, material, tension, racquet, and swing all matter. Hyper-G is described as a square-shaped co-poly designed for spin, while Ghost Wire has a round, slick surface intended to support string movement in a hybrid setup.

Which option should I consider for comfort?

HEAD Velocity MLT is a multifilament with a lively feel, and Tecnifibre X-One Biphase is described as emphasizing comfort, power, and feel. Ghost Wire is a softer-design co-poly option, but it remains polyester. Your preferred tension and individual response to a string also matter.

Is polyester a good choice if I have arm discomfort?

Polyester can feel firmer than a multifilament, and comfort varies by player, racquet, and tension. Ghost Wire is described as a softer co-poly, but that does not make it the right choice for everyone. If you have ongoing arm discomfort, consider talking with a qualified stringer or health professional before selecting a setup.

What is the difference between 16L and 17 gauge?

Gauge labels describe string thickness, but the exact diameter can vary by product. Hyper-G 16L is listed at 1.25 mm, while Mach-10 17 gauge is listed at 1.20 mm. Compare the millimeter measurement when it is available rather than relying on the gauge label alone.

Can I use Ghost Wire in a hybrid setup?

Yes. Its product description identifies it as a suitable cross string alongside a poly or multifilament main. Ask your stringer to confirm the combination and tension for your racquet and preferences.

Final Recommendation

For a thin multifilament with a lively feel, start with HEAD Velocity MLT. If you want polyester, TRU PRO Ghost Wire offers a softer-design 1.22 mm option, while Solinco Hyper-G is the better fit to consider for a shaped, spin-focused response. Solinco Mach-10 is the thinnest by its listed diameter, and Tecnifibre X-One Biphase is a compelling choice when comfort and power matter more than choosing the smallest measurement. Match the string to your playing style and comfort needs, not just the gauge.