Babolat RPM Rough is a rougher version than the RPM Blast which will allow for increased spin potential. The Babolat RPM Rough features an octagonal section with a rough texture, and cross-linked silicone-producing a unique sensation thanks to the high-density Co-PET. This string is an excellent choice for big hitter looking for the ultimate spin experience. Specifications: Technology: 8-sided co-polymer monofilament polyester (Co-PET) with silicone coating. Length: 40 ft/12 m