MATERIAL: Polished stainless steel is non-fading, durable and weather resistant, does not readily corrode, or rust and the rubber ball is soft for using, prevents scratching. HORN SIZE: Length-18cm(7.0"); Metal mouth - 7.3cm(2.9"). Mounting dimensions: Handlebar diameter - 2.22 cm(0.87"). EASY TO INSTALL: Just use a hex key/screwdriver(not included) to tighten the screws, easy to install and remove from the handle bar 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 vehicles as Golf Carts, Boats, RV's, Bicycles, Motorcycles, etc. Customize your bike the way you want for making a great attraction on your bike.(For ages 6 and above) Classic trumpet-style shape offers timeless retro look! Funny loud and long sound tells others your coming. Protect the safety for you and others. Special screw design, easy to install and remove from the handle bar of a bike. Great Practical -- designed for a bike or scooter racing bikes as a safety warning bell. Lightweight, beautiful and sturdy for a long time use. Kindly Note: If the rubber ball falls off due to a violent collision, you can install easily by hands.(AS THE PICTURE SHOWS) Because of the workmanship, there will be lubricating oil behind the extruded part. Wipe it with a soft duster before using. Package included: 1pcs*Bike Horn