ANTIRUST: The bike bell made by high quality aluminum and plastic material that is anti-rust and anti-aging. These factors provide a prolong usage to men and women bikes, boys' and girls' bikes.LOUD WARNING BELL: This bike horn ring features a rotated collision sounding system that delivers loud ringtones. Loud ringtones can catch attention of pedestrian and offer you a safe cycling on the road.EASY TO INSTALL: This classic bicycle bell comes with a quality and durable mounting bracket that allows easy installation as a part of bike components handlebars with outside diameter 20-25 mm. & DURABLE: This bicycle ring features and durable at the same time in the reason of high quality material. The bike bell may be pressed in the transportation, just spin the upper shell and pull it up a little ring will work as well.FIT FOR MOST BIKES: This bell can for most mountain bikes, road bikes, exercise bikes, kids mini bike, or vintage bike. And it also can be extensive used for BXM bikes, bikes, Giant bikes, Kids Bike etc. It is a wonderful and perfect bicycle bike ring horn.Suitable for Kids ,Adult,Girls,Boys,Men,Women Biker Fit handlebar Size: 20-25mmMaterial: Aluminum & PlasticColor: blackPackage Contains1 * Bike BellOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.