Biltwell Replacement Rubber For Alumicore Grips Reinvigorate your AlumiCore grip sets with these replacement grips. Thermoplastic Vulcanizate(TPV) rubber sleeve has knurled surface to ensure traction as well as comfort. The UV resistant material that is not only soft and comfortable, but extremely durable for longevity. Features Chocolate color 1 handlebar diameter 4-1/8 long UV and weather resistant TPV rubber compound Injection molded Grooved for safety wire installation Diamond pillow surfacing