Flat round thumb rest with cushioned design fits on the Clarinet thumb rest to make playing more comfortable as it cushions the thumb supporting the clarinets weight. It might be small but it makes playing so much more comfortable; . Rubber thumb rest cushion. Cushioned design offers comfort for the players thumb. Model 1726. Batteries (not included). Size H0.5, W4, D6.5cm. Maximum weight capacity 0.01kg. Manufacturers 2 year guarantee.