MATERIAL: Polished stainless steel is non-fading, durable, and weather-resistant. It does not readily corrode or rust, and the rubber ball is soft for use and prevents scratching. HORN SIZE: Length-18cm(7.0"); Horn ball diameter - 5.5cm(2.2"); Metal mouth - 7.3cm(2.9"). Mounting dimensions: Handlebar diameter - 2.22 cm(0.87"). EASY TO INSTALL: Use a hex key/screwdriver(not included) to tighten the screws, easy to install and remove from the handlebar of a bike. SAFE AND LOUDLY: Clear the way with a distinctive honk by squeezing the rubber ball on the horn, the unmistakable sound lets everyone know you're coming. This classic retro bicycle bell is universal for any vehicle as Golf Carts, Boats, RVs, Bicycles, Motorcycles, etc. You can customize your bike the way you want to make a great attraction on your bike. (For ages 6 and above) bike horn scooter horn bike bell Bicycle Horn Clown horn