Improve your tennis
The right string changes your game. We develop and test Arm Friendly® tennis strings to give you control, spin and comfort — with no compromise on performance.
Find the right string for you
Every game has its string. Start from what you're looking for on court and discover the models best suited to your style.
Control & precision
For those who build the point and want to direct every shot.
Our tennis strings
Eight strings, one goal: to make you play better. All Arm Friendly®, all laboratory-tested.
String Project Keen
A concentrate of technology, solid and responsive.
Discover Keen
String Project Hexa Pro
Designed to support the most complex spin.
Discover Hexa Pro
String Project Sirius
An unbeatable experience and top-level performance.
Discover Sirius
String Project Armour Soft
Modern and technological, designed for high performance.
Discover Armour Soft
String Project Magic
The comfort of a multi with the performance of a mono.
Discover Magic
Reviewed by experts
Independent reviews published by testers and specialist tennis outlets.
Our commitment
Two environmental initiatives we support through partners, with verifiable data.
One product is a new tree in the world
For every product sold we fund the planting of a tree through Tree-Nation: the String Project forest can be viewed on the project's public profile.
Plastic recycling and recovery
Plastic pollution is one of the most serious environmental threats. With Plastiks.io we fund plastic recovery and recycling in projects around the world.
Ready to improve your game?
Choose the string that suits your style and feel the difference from the first rally. Free shipping to Italy over €50.