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.
Arm Friendly®
String Project Armour
An evolution in ball feel and control.
String Project Armour is a co-polyester competition monofilament tennis string (Soft Polyester + High-Density Polyester HDC), engineered to deliver an evolution in ball feel and control. Its smooth surface ensures excellent snap-back and greater impact consistency. Arm Friendly® certified with 8/10 comfort.
8/10
Comfort
9/10
Spin
7.5/10
Power
Technical Specifications and On-Court Ratings
Competition Feel and Total Control
String Project Armour delivers competition-level control (8.5/10), letting you place every shot with precision and confidence. Spin (9/10) is generated naturally thanks to the excellent snap-back, while power (7.5/10) is contained and calibrated, ideal for those who prefer to build the point with tactical intelligence rather than brute force.
Power7.5/10
Comfort8/10
Control8.5/10
Resilience8/10
Spin9/10
Tension8.5/10
Ratings measured in the laboratory by Pro-t-one (Eng. G. Medri), as are the technical specifications.
"Arm Friendly®" Technology: Comfort Without Compromise
The co-polyester composition balances Soft Polyester and High-Density Polyester (HDC). Soft Polyester ensures softness and vibration absorption, while High-Density Polyester provides structural stiffness, impact consistency and long-term durability. The smooth surface of the round cross-section contributes to a clean, predictable snap-back.
Technical Data Sheet
- Cross-section
- Round
- Available gauges
- 1.25 (16L) · 1.32 (15L)
- Dynamic stiffness
- 230 g/mm
- Tension range
- 18 / 22 Kg
Laboratory test report · Pro-t-one (Eng. G. Medri)
Competition Technology and Composition
String Project Armour is made of co-polyester, a composition that balances Soft Polyester and High-Density Polyester (HDC). Soft Polyester ensures softness and vibration absorption for its Arm Friendly® certification, while High-Density Polyester provides structural stiffness, impact consistency and long-term durability. The smooth surface of the round cross-section contributes to a clean, predictable snap-back.
The manufacturing processes
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.
Absolute Control and Superior Feel on Court
On court, Armour stands out for its versatility. In a full-bed setup it offers a solid impact that instils confidence in every shot. In a hybrid setup, its smooth texture and responsiveness generate unusual spin for a co-poly, with a dynamic response to the ball. Power is manageable, allowing you to meter force with precision. Despite its robustness, Armour offers remarkable comfort, absorbing vibrations and protecting the arm.
Competition Feel and Control
Armour offers competition-level control (8.5/10), with direct, communicative impact feedback. Its impact consistency lets you build the point with tactical precision.
- Direct impact feedback
- Excellent shot consistency
- Precise directionality
- Tactical point construction
Surprising Spin Generation
With 9/10 spin, Armour generates effective, natural rotation thanks to its clean, predictable snap-back. The smooth surface and Low Friction treatments amplify the string's return to position.
- Natural, consistent 9/10 spin
- Clean, predictable snap-back
- Effective rotation on every shot
- Heavy, controlled topspin
What the Experts Say
Independent reviews published by testers and specialist outlets.
Who It's For
Control-oriented competitors
Those who build the point with tactical intelligence and want a string that returns direct feel and precise directionality on every shot.
Those seeking consistency
Those who want a string with solid, predictable impact that keeps its properties over time thanks to 8.5/10 tension maintenance and 8/10 resilience.
Those who want spin without giving up control
Those who generate spin as an integral part of their game but need rotation to be controlled, precise and repeatable.
Ready to Armour Up Your Game?
Choose the format that best suits your needs. Free shipping from €50.
200 m Reel
~17 stringings
-
~€6.41 per stringing
- Free shipping
- 1 Dampener
- 2x Dry Overgrip pack
Gauge:
Pack of 6 Sets
6 stringings
-
~€8.98 per stringing
- Free shipping
- 1 Dampener
- 2x Dry Overgrip pack
Gauge:
Pack of 3 Sets
3 stringings
-
~€9.97 per stringing
- Free shipping
- 1 Dampener
- 2x Dry Overgrip pack
Gauge:
Single Set
1 stringing
-
- Free shipping
- 1 Dampener
- 2x Dry Overgrip pack
Gauge:
Frequently Asked Questions (FAQ) about String Project Armour
What is String Project Armour?
String Project Armour is a co-polyester competition monofilament tennis string (Soft Polyester + High-Density Polyester HDC). It is engineered to deliver competition-level control (8.5/10) and spin (9/10) with Arm Friendly® comfort of 8/10.
At what tension should String Project Armour be strung?
The recommended tension range is between 18 and 22 kg. Lower tensions (18-19 kg) favour comfort and power, while higher tensions (21-22 kg) maximise control and directional precision.
Which gauges is String Project Armour available in?
Armour is available in two gauges: 1.25 mm (16L) for greater sensitivity and spin, and 1.32 mm (15L) for greater control, durability and impact consistency.
Is String Project Armour suitable for players with arm problems?
Yes, Armour is Arm Friendly® certified with 8/10 comfort. Its co-polyester composition with Soft Polyester ensures good vibration absorption, while still being a performance-oriented competition string.
What is the difference between String Project Armour and String Project Hexa Pro?
Armour has a smooth round cross-section and is oriented towards feel and impact consistency, with 8.5/10 control and 9/10 spin. Hexa Pro has a hexagonal cross-section and is more oriented towards technical spin (9.5/10) and control (9/10). Armour has lower stiffness (230 vs 250 g/mm), making it slightly more comfortable.
How long does String Project Armour last?
Armour has 8.5/10 tension maintenance and 8/10 resilience, making it one of the most durable strings in the String Project range. The Liquid Wax treatment and Pre-Stretch technology help keep its properties consistent over time.