Overview Material : Silicone Nominal Inside Diameter : 0.2 Inches Item Diameter : 8 Millimeters Brand : LitOrange Color : Clear 40A About this item Material: Silicone (Better than rubber). Quantity: 500 Pieces. Size: 8 mm/0.3 inch outer diameter, 5 mm/0.2 inch in inner diameter and 1.5 mm/ 0.06 inch in thickness Litorange Keyboard Kit is the essential accessory kit to improve key actuation speed, reduce bottoming out sound, reduce the shock on your fingers, and to maintain a clean keyboard Can be used across a wide temperature range from -65 degrees F (-54 degrees C) to 450 degrees F (232 degrees C) 500 Silicone O-Ring Dampeners limit noise on keys and provide faster actuation with a 2mm thickness | 40A Shore (Soft) Transparent O-Rings allow LED Backlighting to shine brightly through keys 40A (SOFT) O-Ring: Softer O-rings provide a softer padded landing with every keystroke that reduces the impact on your fingers and eliminates the bottoming out "clack" sound of your keyboard