Purchased in 2022 and used by a child for about a year. Sold as a set of two. They are clean and show no signs of deterioration, so I think they can still be used. Noise Eater NE-10 This is a vibration-damping item that allows for quieter V-Drums playing in your home living room or room. It helps solve the problems of noise and creating a practice environment that trouble drummers in various living environments such as detached houses, apartments, and apartment buildings. The NE-10 is a board-type that is set under the pedal to create a vibration-damping effect. It can be easily incorporated into various V-Drums sets, allowing you to enjoy playing more casually.