HIGH QUALITY - The front section of the horn is made of polished stainless steel which ensure durable and non-rust features. The horn bulb with patterns is made of rubber to ensure non-broken and non-slip. <br><br> HORN SIZE - Retro clown horn length diameter: 13.5cm/5.3". Horn ball diameter: 4.5cm/1.8". Metal mouth: 7cm/2.8". Mounting handlebar diameter: 2.2-2.3 cm/0.86-0.9". <br><br> SAFE AND LOUDLY - By squeezing the rubber bulb on the horn can attract attention of others and remind them to keep a safe distance from you. This squeaky sound of bicycle clown horn will improve your safety riding life. <br><br> EASY TO INSTALL - Just use a hex key/screwdriver(not included) to tighten the screws, which easy to install or remove from the handle bar of a bike. The bike horn bell will not be loose after being installed which giving you a good experience. <br><br> UNIVERSAL FOR BIKES - This classic retro bicycle bell is universal for most of vehicles as adult s or kids bicycles, motorcycles, etc. Decorate your bike with our bike horn and get a lot of compliment for your bicycle.