Dcolor Black Rubber Bulb 21mm Dia Handlebar Bike Bicycle Air Horn Bugle Trumpet Product Name : Bicycle Air Horn;Color : Silver Tone, Black Main Material : Plastic, Rubber;Overall Size : 15 x 7.1cm/5.9" x 2.8" (L*Max.D) Fit Handlebar Diameter : 21mm/0.83" Weight : 49g Package Content : 1 x Bicycle Air Horn