Because the strings are the powerhouse of any racquet, choosing the right string is essential. Babolat invented tennis strings in 1875 and has continued to innovate ever since. If multifilament strings break too quickly, or if a more arm-friendly monofilament is needed, RPM Soft offers the best of both worlds. This innovative polyamide monofilament provides greater durability than a multifilament while delivering more comfort than a traditional polyester monofilament.