Butterfly Sapphira is an allround-style rubber, suitable for developing players and veterans alike. For beginners, Sapphira will perform well both offensively and defensively, as it is consistent and easy to control. For the more experienced players, this rubber allows one to be very aggressive for the same reasons. With a medium sponge density and more spin than Sriver, Sapphira is a wonderful option for a wide variety of players and styles. If your goal is to outlast your opponents, look no further! SPECIFICATIONS: Class: All-Round Surface: Inverted Speed: 8.75 Spin: 8.5 Density: 35 To get the most out of your rubber, it is recommended that you clean it after each use and store it properly. Using our Racket Care Kit, use one pump of the Spin Refresh on each side of inverted rubber, then use the Rubber Care Sponge to thoroughly clean it. Once it is dry, apply your protective sheets and then place it in your case. Ideally, store your paddle in a climate-controlled space and avoid extreme temperatures for extended periods of time.