Oi Prima Bell. Features: Wavetek hammer delivers a louder, longer-lasting, more consistent chime Refined Oi aesthetic with tapered edges and intricate laser etching Hinged clamp installs over bar in seconds, built in cable management system Aluminum ring offered in a variety of colors Small fits 22.2mm bars Large size includes shims to fit 23.8-31.8mm bars 2 year warranty Specs: Model:Oi Prima, Large Color:Anthracite Material:Aluminum/Plastic Package:Each