One of Babolat’s most popular string, RPM is a high performance soft co-polyester with an octagonal (8 sided) ring. This results in high levels of spin and precision and unique sensation of control at impact. Players can also expect the string to last. The 17 gauge offers a great balance between sensation and durability. String used by Eugenie Bouchard (CAN), Rafael Nadal (ESP) and Stan Wawrinka (SUI).