Features: Lightweight and perfect circular design of the piano Felt Pads, standard size washers, compatible with most drum sets. Quality felt material of the piano Accessory prevents metal to metal contact and perfectly protects your precious piano. To improve the sound and performance of your instrument, these felt washers add a bit of grade. Piano Felt Washers are the Replacement tools for worn or moth-eaten punches and accessories for piano adjustment and repair. These Piano Regulating Tools Keyboard Balance Washers are suitable for leveling keys. Package Includes: 90x Piano Keyboard Washer Specifications: Material:Pure Wool Diameter: Approx.22mm/0.86inch Thickness:Approx.5.2mm / 0.2inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.