Features: Thumb finger rest is made rubber material, with high flexibility, comfortable wearing feeling. It is tear-resistant and durable. It makes you feel comfortable, easy to use. For 14.5~17.5mm Diameter Thumb are suitable universal. Rubber protector can be eliminate thumb pain, protect for extra thumb rest and protect your instruments and hand. Wonderful term to rest your thumb and bring you better playing performance. Its special shape design fits your metal thumb rest very perfectly. Specifications: Material: Stainless Steel+Rubber Color: As The Picture Shows Package Weight: approx.14g Thumb Rest Size: approx.27x16x20mm/1.1x0.6x0.8in (LxWxH) Protector Size: approx.20x15mm/0.8x0.5in (DiaxThick) Note: Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Pc x Thumb Rest 1Pc x Rubber Cushion 2Pcs x Screw