Cympad Optimizer cymbal washers are made from a premium-quality cellular foam material that provides superior sound and durability over conventional felt washers. They are of consistent size and density, providing superior cymbal suspension and isolation from stands and mounting hardware. This results in a better sound and a more natural, comfortable feel for drummers. The 40mm diameter and 12mm height make them ideal for individual cymbals and stacks. Each pack includes 5 optimizer cymbal washers.