Reduce vibrations---Help to minimize the vibration of your racket when we play tennis game. The perfect blend of minimalism and shock absorption. Exquisitely slim and manufactured to optimize your tennis game! Package---Set of 4 ：3 Blue ones、3 Red ones、3 Yellow ones and 3 orange ones). Lightweight.Effortless.Powerful.---It easy to stretch our tennis dampener to accommodate all string patterns.