Tennis racket vibration-absorbing shock absorber. This is one white vibration dampener, also known as a "vibecut". - Product Name: VIBECUT - Application: Tennis accessory The black one is a sample. Professional tennis player, Aoi Ito, uses this. It's in good condition as it has been used very little, but please refrain from purchasing if you are concerned about minor details as it has been stored at home. Red and black colors are also available. It attaches to the top of the tennis racket grip. Thank you for viewing.