CYMPAD Optimizer cymbal washers are made from a premium-quality cellular foam material and are a major improvement over conventional felt washers. Consistent in size and density Optimizers provide superior cymbal suspension plus isolation from stands and mounting hardware — offering modern drummers a better sound and a natural more comfortable feel in every drumming situation. 40mm in diameter with 8 12 and 15mm heights for individual cymbals and stacks Optimizer models also include a 3-piece set for hi-hats and an 18mm version for ride and larger crashes.