Antirust The bicycles is goodquality copper alloy there is coating on it outside. It will not rust even be used on a rainy day usually.Clear Loud Tone The handlebar has a loud and also clear Ding helping others to aware of your making your cycling journey more safety.Easy Installation Our copper alloy fit for bicycles from 22mm to 32mm handlebars stems. Please measure handlebars before purchase.Retro DesnThe with delicate outlooks and is small in size.. Can be positioned up on top of bar in front of bar for more aerodynamics less noticeable profile.Fit for Most