Eforstore MTB Bicycle Mirror Bikes Handlebars Handlebar Bar End Rearview Mirrors for Bicycles Cycling Road Mountain Bike 360 Rotate Material: ABS plastic (The mirror is made of shatter-proof anti-fog polycarbonate, not glass.) Handlebar inside diameter range 17 to 22.5mm, Mirror size: 7cm x 4.3cm (L x W). Smaller than normal size and will not be a hinder when cycling. Wide view angle, well protect your safety in cycling. Package includes: 1 x Bicycle Mirror;1 x Assembly Wrench.