1. Special shape design fits your metal thumb rest very perfectly. 2. Thumb finger rest is made rubber material, with high flexibility, comfortable wearing . It is tear-resistant and durable. 3. It makes you feel comfortable, easy to . For 14.5~17.5mm Diameter Thumb are suitable universal. 4. Rubber protector can be eliminate thumb pain, extra thumb rest and your instruments and hand. 5. Wonderful term to rest your thumb and bring you better playing performance. Thumb Rest Size: (L x W x H): Approx. 27 x 16 x 20mm / 1.1 x 0.6 x 0.8inch Protector Size: 20 x 15MM / 0.8 x 0.5Inch(Dia x Thick) Number: Thumb Rest color:Silver Material:metal+rubber Package Contents: 1 x Thumb Rest 1 x Rubber Cushion 2 x Screw Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.