Kitty String - 100% Polyester Professional String
Kitty string uses a very soft form of polyester that gives you a smoother feel during play and doesn't rough up your hands as much either. They also give you just slightly more length averaging around 43 to 45 inches so you have some extra room to adjust (110-115cm).
(Note: No finger loop is tied in the string allowing you to adjust to your height and tie your own.)
Professionals around the world are beginning to choose Kitty String as their weapon of choice in competition and for good reason. For yo-yo string it doesn't get much better then this.
Available here is the standard Kitty String. This is the most recommended version and gives smooth unresponsive play while still giving extremely tight binds to ensure long spin every throw.