Come and see our amazing products. These Bicycle bells are made of aluminum and plastic. Cute and fashionable, clear and loud sound. The diameter to fix on the bike handle is 2.2cm. It is suitable to be installed on most bikes. Your logo can be imprinted on the top of the bell with a waterproof sticker. Perfect to promote your brand. Pls confirm further with us if any query about packing info, inventory status and time schedule.