This bike bell is made of premium aluminum alloy, featuring clear loud sound that can be heard easily in different road conditions to remind others of your coming and ensure riding safety. It is sturdy and compact, won't take extra space on your handlebar. It fits 0.75in to 1in handlebars, compatible with both mountain bikes and road bikes. Suitable for both adults and kids, easy to install and operate, it is a practical cycling accessory for daily commuting, outdoor cycling trips and daily riding training.