I believe this is an old air hockey puck because there are numbers on the back and the groove on the edge is shallow, but I'm not an expert, so please judge based on the images. The center of the puck is thin, but I think it's still usable. It floats, so double-sided tape is required. The whole thing has been sanded. The surface dirt has been removed with bleach. Please comment if you have any questions. I can also add more images. Instant purchase OK.