Butterfly Aibiss rubber is a high-friction rubber which balances the characteristics of a friction rubber and more traditional high quality Butterfly rubber sheets. A specialized top sheet with a pimple shape which enables heavy spin has been combined with a hard sponge; this results in high speed as well as devastating spin potential. Aibiss, with heavy spin and a high throw angle, is recommended for the player who aims at making the best use of the characteristics of a friction rubber, especially one using precise technique on the table and counter attacking play. Surface: Inverted Speed: 10.5 Spin: 11.0 Density: 50 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.