Ring-a-ding-a-ding! Get noticed and keep slowpokes out of your way with our Serfas line of minimalist style simple-to-use handlebar mounted bicycle bells. The perfect socially acceptable alternative to shouting crowd favorites such as "watch out!" and "move it or lose it!" Features: Brass Construction (Longer Ringing Tone Compared To Aluminum Construction) Multi Strike Mechanism Secure Screw Type Bracket w/ Rubber Insert Polished Brass Finish Specs: Bar Fitment: 19 ~ 22.2mm Diameter Handlebar