One of Babolat's most popular strings, the RPM is a flexible high performance copolyester with an octagonal ring (8 sides). This results in high levels of spin and precision and a unique feeling of control on impact. Players can also expect the chain to last. The 16 gauge provides additional durability. Rope used by Eugenie Bouchard (CAN), Rafael Nadal (ESP) and Stan Wawrinka (SUI).