Manufacturer: Kimony Quake Buster QUAKE BUSTER Item No.: KVI205 Color: BL (Blue) Kei Nishikori also uses this product. This is a mushroom magic vibration dampener. It responds to the strength of the vibration and the response of the strings. A new type of vibration dampener with excellent effect. Based on a highly efficient damping theory, Kimony's original product, which has completed the world's first 360-degree vibration absorption, Mushroom Magic. 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 (Will be delivered to your mailbox.) ★ Immediate purchase without comment is OK.