Product material: 7075t+ copper Loudspeaker DB: 80dB Product size: about 6.5 4.5 1.5cm Suitable vehicles: road bike /mtb/ folding bike, etc Handlebar diameter: 22-31.8mm Product features: small and light, easy to install, clear ringtone Specifications: 1. [hidden bell is simple and convenient]The compact shape is hidden in the handlebar, which does not affect the handbrake shift and other operations 2. [design of copper metal shell] the copper metal shell has higher hardness and longer sound 3. [micro arc paddle, comfortable to handle] the micro arc shape design is smooth and does not hurt hands, easy and labor-saving 4. [waterproof and antirust paint] the copper outer antirust and waterproof paint has long service life and strong durability 5. [PC base, tough and durable] applicable handlebar size: 22.2-31.8mm, equipped with three types of gaskets, suitable for a variety of handlebar sizes Package Included:1 x Bicycle Bell Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)