Features: he aluminum alloy bell body is matched with a tap, and the ringing bell is loud. It is die-casted from a single piece of aluminum to prevent rust and improve anti-sweat corrosion. The average density is high in weight density, and the weight is greatly reduced, which is convenient for movement and storage. The high-quality ringtones are crisp and loud, not harsh, and the tail sounds long and sweet, and the ringing sound can reach more than 75 decibels. It can also safely remind the front to avoid in the noisy streets. Description: Durable hammer, imported piano steel wire, 10,000 hits without deformation. Specifications: Material:Aluminum alloy, plastic, spring Decibel: 90db Applicable caliber: 22.2-22.8mm Size: 41.20*15.00mm colour:Black/blue/red/silver/gold/pink Package Included: 1*Bicycle invisible bell Notes: 1. Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. 2. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item.