Cassette three-claw guard: outer diameter 135mm (suitable for cassette hubs with 54mm hub lug diameter) PS:There is also a saying that the three-claw guard is suitable for cassette V-brake hubs, which is also correct, but this is a general statement. The actual use depends on the size of the hub lug diameter. Made of plastic material, lightweight and durable. Keeps the chain from being shifted into the spokes when out of adjustment. Suitable for mountain bikes, road bicycles, folding bike etc. Colour:Transparent Material:Plastic Package Contents: 6 x Bike Spoke Protector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.