Altruism Aluminum Alloy Bicycle Bell Bike Bell Sound Resounding Bike Handlebar Ring Horn Fits handlebars with 21.7mm - 28mm outside diameters Beautiful design.It comes with trigger-pull lever. MaterialAluminum alloy Three colorsrainproof. High grade PC and alloy Name:ALTRUISM Aluminum Bicycle Bell For Mountain Bike Brand:ALTRUISM Model:CL-01 Material:PC + Aluminum Weight:35g Diameter:For bicycle handlebar diameter 22-28mm Use:Mountain Bike, Folding Bike, Road Bike ETC Color:White, Black, Red, Blue,Green Packing list:Bell*1pc