Manufacturer: Kimony Quake Buster QUAKE BUSTER Item No.: KVI205 Color: GN/PR (Green/Purple) Kei Nishikori also uses this. This is a mushroom magic vibration dampener. It reacts according to the strength of the vibration and the response of the strings. A highly effective new type of vibration dampener. Based on a highly efficient damping theory, Kimony's original product, the Mushroom Magic, absorbs vibrations in 360 degrees, a world first. Available in 17 colors. ① White ② Black ③ Red ④ Blue ⑤ Yellow ⑥ Orange ⑦ Green ⑧ Clear ⑨ Gold ⑩ Blue x Yellow ⑪ Blue x Pink ⑫ Green x Purple ⑬ Black x Red ⑭ Red x Green ⑮ Red x Blue ⑯ Red x White ⑰ Sakura Shipping: Letter Post (Delivered to your mailbox.) ★ Immediate purchase without comment is OK. Type...Racket accessories Details...Vibration dampener