Food grade silica gel, this bicycle crank protector is low carbon and environmentally-friendly. With soft, skid resistant, shake proof, heat and oil resistant performance, the crank protectors are durable and easily washable. Integrated modeling design, flexibility, stretch-resistance, variety of colors make your favorite bicycle more distinctive. With excellent elasticity and abrasive resistance, it can be used for road bike, mountain bike, folding bike, fixed gear bike, etc. Special grain surface technology can protect the crankset well and carefully, you will not be bothered by frequently changing crank for your bicycle. Specification: Material: Silica Gel ColorBlackRedBlueGreen Size: Approx. Cover without Hole Length: 43mm/1.7 inch Cover with Hole Length48mm/1.9 inch Width: 34mm/1.3inch Package Includes: 1 Set(4 Pieces of Bicycle Crank Protectors) Note: Please allow slight difference due to mannual measurement. Color might be slightly different due to different displayers. Thanks for your understanding.