High quality: the bell is made of high quality aluminium alloy, with rust and ageing protection coating, durable, suitable for handlebar diameter: 1.8 cm-3.2 cm. Product design: the hard copper hammer combined with the internal collision sound system, the classic bicycle bell brings us a clear, sweet and loud sound. Pedestrians and passing vehicles can hear your ringtone clearly, which is our safety warning. Easy to install: the classic bicycle bell is easy to install on your bike, just a hex screwdriver can be installed in minutes. PERFECT GIFT:This car is a retro atmosphere, it is the perfect gift for your friends driving around. Widely used: this product for mountain bikes, road bikes, city bikes, scooters, MTB, BMX etc.