String reel BABOLAT RPM BLAST 200M The winning choice of Rafael Nadal, Jo-Wilfried Tsonga and Samantha Stosur. The right string for players who need more control and incredible torsion!. Equipped with the latest technology, this high density co-polyester monofilament string provides a completely unique feel as well as a powerful and ultra-fast response. The octagonal section and cross-linked silicone shell provides exceptional spin and allow the string to quickly return to its original position and it is better to �bite� the ball for maximum torsion. These tennis strings are used mainly by professional players and tennis fans of a good level. The polyester used in the manufacture of this category of strings provides the highest possible strength.