Bike Wheel Spoke Protector Mountain Sprocket Cover ProtectiveDescription:Made of ABS plastic material,lightweight and durable.High strength, not easily broken, anti-wear.Keeps the chain from being shifted into the spokes when out of adjustment.Suitable for mountain bikes, road bicycles, folding bike etc.Specification:Material: ABS PlasticSize A:Outer Diameter: Approx.165mm / 6.5inch;Inner Diameter: Approx.37mm / 1.5inchPackage Includes:1 Piece Bike Wheel Spoke Protector