Coming in loud and clear: this USA-made bicycle bell combines an elegant, functional design with robust materials to create a truly best-in-class product. The all-metal construction features stainless steel with a brass alloy dome and aluminum hammer. The bell tone is clear, strong and long, in fact up to three times longer than other bike bells. Black DLC (Diamond Like Carbon) finish. The highly adaptable mounting system attaches to nearly any handlebar (22.2-31.8mm) Simple installation (2.5mm hex tool required). Lifetime guarantee.