Description: 【Material】: This Bike Bell is made of pvc and metal, which is longevity and designed to withstand the rigors of daily use while maintaining its attractive appearance. 【Size】: The Bicycle Bell measures 5.5cmx20cm/2.17inchx7.87inch, making it good size for most bicycles. The rubber ball has a diameter of 5cm (1.97") . It can be easily mounted on handlebars with a diameter of 2.3cm(0.91inch"). 【Easy Installation】: Our Air Bell is easy to install, which can be installed at different positions on your bike such as the front head, middle tube or tail end for maximum visibility and security. 【Loud and Clear Sound】: Ensure your security on the road with our loud Bugle Bell. By squeezing the rubber ball on the bell, you can clear your path with its distinctive honk, alerting everyone around you of your presence. 【Wide Application】: The Bicycle Accessories make a good addition to any type of vehicle, fitting on various types of bikes including beach bikes, leisure bikes, bicycles, and mountain bikes. Specification: Material: PVC and Metal Size Chart: 5.5cmx20cm/2.17inchx7.87inch Package Includes: 1 Bike Bell (4 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.