String Project Hexa Pro, hexagonal monofilament tennis string
String Project Hexa Pro is a monofilament tennis string with a hexagonal profile, made of co-poly (Soft Polyester + High-Density Polyester HDC) and treated with Alpha-olefins. The hexagonal shape is specifically designed to "grab" the ball, amplifying snap-back and maximising the most complex spin. Arm Friendly® certified with 8/10 comfort.
- Hexagonal co-poly monofilament
- Gauges 1.20 · 1.25 · 1.30 mm
- Arm Friendly®
- Tension 17–22 kg
Playing profile
String Project Hexa Pro offers top-of-the-category spin (9.5/10), thanks to its hexagonal profile that grabs the ball and amplifies snap-back. Control (9/10) is its main strength: every shot is directed with surgical precision. Power (8/10) is well calibrated, enough to drive effectively without sacrificing precision.
- Spin9.5/10
- Control9/10
- Power8/10
- Comfort8/10
- Resilience8/10
- Tension8/10
Ratings and technical specifications measured in the laboratory by Pro-t-one (Eng. G. Medri) — laboratory test reports: 1.20 mm (PDF) · 1.25 mm (PDF).
Precision and complex spin on court
On court, Hexa Pro stands out for its ability to support the most complex spin. The hexagonal profile grabs the ball with superior grip, letting you impart effects that would be harder to achieve with a round-profile string. Control is the real protagonist: every shot is directed with confidence, enabling precise spin variations and angles.
Surgical control
Hexa Pro offers control (9/10) among the best in the range. The hexagonal profile and controlled stiffness let you direct every shot with confidence, ideal for players who build the point with precision.
- Exceptional directionality
- Precise angles
- Controlled spin variations
- Solid, communicative feel
Extreme spin and rotation
With 9.5/10 spin, Hexa Pro is among the most effective strings for generating rotation. The hexagonal profile grips the ball and amplifies snap-back, producing heavy shots with curved, dipping trajectories.
- Top-of-category 9.5/10 spin
- Hexagonal profile for ball grip
- Amplified snap-back
- Heavy topspin and kick serve
Advanced composition and hexagonal profile
The distinctive feature of String Project Hexa Pro lies in the combination of two hallmark elements: the hexagonal profile and the co-poly composition (Soft Polyester + High-Density Polyester HDC). High-Density Polyester provides structural stiffness and durability, while Soft Polyester ensures the softness needed for Arm Friendly® certification. The Alpha-olefin treatment completes the profile, adding elasticity and protection against wear.
The hexagonal profile is not just aesthetic: every edge helps grip the ball, creating a superior grip effect compared to traditional round profiles, with controlled stiffness and exceptional mechanical durability.
The manufacturing processes
Spring Load
This technology allows the molecular chains to contract repeatedly, resulting in minimal tension loss and, above all, greater stability of the string's properties.
Pre-Stretch
Thanks to the "pre-stretch" of the core, the entire string minimises tension loss while at the same time allowing a lower stringing tension.
Double Heating
The "heat treatments" remove internal stresses and even out any irregularities in the string. They also make the strings more flexible and elastic.
Liquid Wax
The string is finished with a layer of wax. This treatment significantly extends its lifespan by reducing wear and making stringing easier.
Low Friction
Reducing the string's friction delivers reduced string movement, greater spin potential thanks to improved snap-back, and a longer lifespan.
Technical data sheet
| Feature | Value |
|---|---|
| Type | Co-poly monofilament (Soft Polyester + HDC), treated with Alpha-olefins |
| Cross-section | Hexagonal |
| Gauges | 1.20 mm (17) · 1.25 mm (16) · 1.30 mm (15L) |
| Dynamic stiffness | 250 g/mm |
| Manufacturing processes | Spring Load, Pre-Stretch, Double Heating, Liquid Wax, Low Friction |
| Recommended tension | 17–22 kg |
The right string if you see yourself here
Spin-specialist competitors
Those who base their game on aggressive rotation and want a string that amplifies topspin and spin variations, thanks to the hexagonal profile.
Control-oriented players
Those who build the point with precision and need a string that responds faithfully to their intentions, offering directionality and precise angles.
Those seeking durability without compromise
Those who want a string that keeps its properties over time (8/10 tension maintenance, 8/10 resilience) without sacrificing spin and control.