Description: - Use ultralight highstrength AL7075 Aluminium Alloy with high quality machined. - be used to effectively prevent the chain and chain from jumping. - It needs to , , so a aluminum alloy as a material with high hardness and long service life. - Novel hollow design, weight, antichain good, used for sprocket, make riding smoother and - More compatible, of 35 diameter convertible to a diameter of after installation.Specification: - Material: 7075 Aluminum Alloy NylonSpecification: φ35mm~mm/ mountPackage Includes:1 Piece Chain4 Pieces Washers1 Piece Frame ProtectorNote:Color might be slightly different due to the color calibration of each individual monitor.Please allow slightly measuring deviation due to manual measurement.