Babolat RPM Team 16 is a new co-polyester and is a slightly more forgiving alternative to RPM Blast. The infusion of micro air bubbles into the string permits additional flexibility without sacrificing durability. Also an excellent choice for big hitters looking for extra spin. Octagonal (8-sided) cross-section adds the extra bite on the ball for added topspin and slice. Convenient reel for frequent stringers.