String Project Hexa Pro, hexagonal monofilament tennis string
String Project Hexa Pro is a hexagonal-profile co-polyester monofilament tennis string (Soft Polyester + High-Density Polyester HDC), treated with Alpha-olefins. Solid on impact, it combines control and spin: the hexagonal shape is designed to "grab" the ball and, together with snap-back, generates the most complex spin. Arm Friendly®, with 8/10 comfort.
- Hexagonal co-polyester monofilament
- Gauges 1.20 · 1.25 · 1.30 mm
- Arm Friendly®
- Tension 17–22 kg
Playing profile
String Project Hexa Pro has two strengths that work together. Control (9/10): the impact is solid and every shot goes where you aim it. Spin (9.5/10): it comes from the edges of the hexagonal profile, which grab the ball, and from snap-back. 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 goes hand in hand: the impact is solid and 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 solid impact 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
Precision spin
With 9.5/10 spin, Hexa Pro is among the most effective strings for generating rotation. The hexagonal profile bites into the ball and snap-back does the rest, producing heavy shots with curved, dipping trajectories.
- Spin 9.5/10
- Hexagonal profile for ball grip
- Effective 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-polyester composition (Soft Polyester + High-Density Polyester HDC). High-Density Polyester provides structural stiffness and durability, while Soft Polyester provides the softness that makes it Arm Friendly®. The Alpha-olefin treatment completes the profile, adding elasticity and protection against wear.
The hexagonal profile is not just aesthetic: every edge helps bite into the ball, with superior grip compared to traditional round profiles. High-Density Polyester, treated with Alpha-olefins, gives it impact consistency and excellent mechanical durability.
The manufacturing processes
Spring Load
It allows the molecular chains to contract repeatedly, with minimal tension loss and greater stability of properties over time.
Pre-Stretch
The pre-stretch of the core minimises tension loss and allows stringing at lower tensions.
Double Heating
The heat treatments remove internal stresses and any irregularities in the string, making it more uniform, flexible and elastic.
Liquid Wax
The string is finished with a layer of wax, which reduces wear, significantly extends its lifespan and makes stringing easier.
Low Friction
Reducing friction offers three advantages: less string movement, greater spin potential thanks to better 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 | 230 g/mm |
| Static stiffness | 0.98 kg/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 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 looking for a string that lasts
Those who want a string that keeps its properties over time (8/10 tension maintenance, 8/10 resilience) without sacrificing spin and control.