Air Horn Kit Single Roof Mount Air Horn; Chrome Plated Spun Copper; 25 in.; Roof Mount; Maximum Output 149.5 dB; FEATURES: Single 25 in. Truck Horn Chrome-Plated; Spun Copper Maximum Output 149.5 db 24 in. Overall Length 6 in. Overall Width If you're the King of the Road - why not sound like it? Ditch your puny, not-so-manly horns for a big ass 24 inch Roof Mounted monster. Air Valve not included. Kleinn automotive air horns offers complete air horn kits, train horns, roof mount truck horns, air systems kit accessories and off road lift kits.