The best tennis strings
Looking for the best tennis strings? The String Project range is designed for every need — control, spin, power or comfort — with monofilament and multifilament strings, all Arm Friendly® and laboratory-tested by Pro-t-one.
There's no single “best string”: there's the right one for your game. Here you'll find our 8 strings compared, each with its dominant trait, to choose with confidence.
Our 8 strings compared
Each string excels at something: start from the trait you want and find the best for you. 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 MagicReady to improve your game?
Choose the string that suits your style and feel the difference. Free shipping from €50.


