.1. The special shape fits your metal thumb perfectly.2. The thumb finger rest is made of rubber, with high elasticity, comfortable wearing. It is tear-resistant and durable.3. Makes you feel comfortable, easy to use. For thumb diameter 14.5 17.5mm, universal ones are suitable.4. The rubber protector can eliminate thumb pain, protect the extra thumb, and protect instruments and hand.5. A wonderful term to rest your thumb and ensure better game performance. Description:Material: Metal & RubberThumb Rest Size: (L x W x H): Approx. 27x16x20mm/1.1x0.6x0.8 Inch Protector Size: 20x15MM/0.8x0.5 Inch (Diameter x Thick)Package Included:1 x Thumb Holder1 x Rubber Cushion2 x ScrewNote:Please refer to the measurement. A small measurement error is acceptable within the normal range. There may be a slight color difference due to monitor, camera or other factors, please refer to the physical item.