1Made of high quality material, high strength, anti-rust, non-deformation, wear-resistant and durable. 2Hollow out design reduces much weight to lessen the burden of long time cycling, also easy for cleaning. 3It can promise smooth rotation of chain, suitable for chain ring between 11-50T. 4Designed for 10 speed mountain bike, easy to install. 5Nice replacement for bike lovers.Features:Made of high quality material, high strength, anti-rust, non-deformation, wear-resistant and durable.Hollow out design reduces much weight to lessen the burden of long time cycling, also easy for cleaning.It can promise smooth rotation of chain, suitable for chain ring between 11-50T.Designed for 10 speed mountain bike, easy to install.Nice replacement for bike lovers.Specification:Brand: ZTTOMaterial: Aluminum AlloyColor: Shown as pictureTeeth: 11-13-16-20-24-28-32-38-44-50TApplicable: 10 speed bikeWeight: Approx. 505gPackage List:1 x Bike Freewheel