If you feel that your bicycle bell sound is weak, you probably need the air horn and you can try our item. Features: The bicycle air horn comes with a metal bracket that easily mounts to the handlebars, even if you're alone. Adopts the metalization process, and the retro design looks more advanced, giving your bike and motorcycle more personality. You press the rubber bulb and the horn can make a classic horn. The product is suitable for bicycles, mountain bikes, beach cars, recreational vehicles, harley cars. Specifications: -- Size: 21 * 5.5 cm -- Material: Galvanized Iron/PVC/Silicone -- Color: Black/Blue/ Green/Silver Package includes: 4 x Bicycle Air Horn Notes: Due to manual measurement and different light parameters, screen, please allow slight size and color error.