Features: Stay safety and be heard with the invisible rings shaped bike bells. Its powerful sound ensures your presences on road. Made from durable materials, this mini size bells is lightweight and easy to install. Its compact size and low weight make it a convenient accessory for any cyclist. Suitable for all cycling enthusiasts, commuters, and students, this concealed bike bells is perfect for anyone who loves riding. Whether you're exploring different terrains or going for a casual riding, this bells will keep you alert. Ride confidently in various settings with the invisible shaped bike bells. It's suitable for use in different environment, ensuring your safety wherever you go. Add a touch of uniqueness to your ride with this stylish invisible bike bells. Its smooth designs and color optional make it a functional and visually appealing accessory for your bike. Specifications: Material: Aluminum Alloy+Plastic Color Options: 4 Colors are Available as Shown in the Picture. Package Weight: approx.35g Applicable Handlebar Diameter: approx.22.2mm/0.87in Volume: 100db (More Size Detail, Please See Photo.) Package Includes: 1Pc Bike Bells note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!