Description: 100%New Brand and Good Quality Color: Black,Silver,Red,Blue,Gold Metarial : Plastic,Aluminum Alloy Size : 38.50*15.00mm Apply Caliber : 22.2-23.8mm Weight : 17.3g Db : 90db Installation: 1.Use cross serew driver take off the screw cap; 2.Open the breach of the ring and assemble on the handle of bike; 3.Adjust the position of the bell and ring it,avoid the touch of aluminium alloy; 4.Use cross screw driver fix the bell Package Include: 1 X bike bell