Hadley is the worldwide leader in air horn systems. You can choose a round or rectangular bell in single or dual projector configurations. The extensive product line also offers horns with a matte black, chrome, or anodized aluminum finish. Hadley air horn systems are widely used as original equipment on over the road, tractor/trailer rigs. Also, when used in conjunction with the Hadley air compressor, our air horns are popular in a variety of vehicles: SUV`s, 4×4`s, vans, pickup trucks, motor homes, motorcycles, and power/sail boats.