Features: Make of Aluminum Alloy, waterproof and antirust ensuring long terms performances. When strucks, it can produce a clearly and pleasant sound, which can effectively remind people and other vehicle to pay attentions to the presences of bicycles. The bikes bells is small and light weights, which will not add much burden to the bicycles and is easy to use. Easy Installation: this Bikes bells can quickly mounted on your bicycles handlebars without the need for Complex steps. It is suitable for most standard handlebars with 22.2mm/0.87inch such as mountain Bikes, bicycles, balance Bikes, tricycles. Specifications: Component: Aluminum Alloy Color: Black A/Black B/Slivery A/Slivery B Size: about 6.5x5.6cm/2.56x2.2inch Package Includes: 1pc Bikes bells note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.