Features: Make of Aluminum alloy, waterproofs and antirust ensuring long terms performances. When strucks, it can produce a clearly and pleasant sound, which can effectively remind people and other vehicles 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. It is suitable for most standard handlebars such as mountain Bikes, bicycles, balance Bikes, tricycles. Specifications: Materials: Aluminum alloy Color: Yellow/Redness/Black/Silver Color/Blue Size: about 53x38mm/2.09x1.5inch Package Includes: 1pc Bikes Bells note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.