Ilius S is the first long pimpled rubber with “Absorber Sponge Heavy” technology developed by Butterfly. The top sheet is rather hard with pimples whose aspect ratio is at the highest limit permitted. The combination of the top sheet and “Absorber Sponge Heavy” makes it easier to push and to return an opponent’s attack with a low defensive shot with heavy or minimal spin. The rubber is recommended for defensive players, enabling subtle changes as well as stability in rallies.