Babolat redefines the concept of spin with the new RPM Blast, chosen by some of the greats such as Rafael Nadal, Andy Roddick, Jo Wilfied Tsonga any many other Babolat Team members.The string shape is octagonal for a better grip on the felt of the ball.The surface is coated with Cross-Linked silicone which generates better spin on the ball and favors a return of the strings to their natural position after impact.The high density Co-Polyester construction increases the reaction of the strings allowing for explosive strokes.Color: BlackCaliber: 1.30 mm200 meter Sring Reel