Features: Used for protecting the instrument keys and fixing keys to increase service life. Adopting high-quality cotton as raw material, the felts make your fingers more easeful. Suitable for all models, such as trumpet, trombone and cornet. Package comes with 10 pcs cotton felt washers for longer using time. Perfect accessory for your wind instrument. Specifications: Color: White Item Size: 1.8 * 1 * 0.3cm / 0.71 * 0.39 * 0.12in Item Weight: 0.23g / 0.008oz (single felt) Package Size: 8 * 8 * 1cm/ 3.15 * 3.15 * 0.39in Package Weight: 3g / 0.11oz Package List: 10 * Felt Washers