1. Special shape design fits your metal thumb rest very perfectly. 2. Thumb finger rest is made rubber material, with high flexibility, comfortable wearing feeling. It is tear-resistant and durable. 3. It makes you feel comfortable, easy to use. For 14.5~17.5mm Diameter Thumb are suitable universal. 4. Rubber protector can be thumb pain, protect extra thumb rest and protect 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): . 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) Model 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.