Babolat RPM Dual Tennis String 17G Babolat changes the game in poly strings yet again with the introduction of Babolat RPM Dual 17G. The standard co-polyester monofilament string is enhanced with the addition of a titanium co-polyester section which, in addition to providing a more solid feel, improves durability with its harder surface... Size - (See Description) | Color - (See Description) Authorized Babolat Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.