FIAMM 66040" Big Boss 2 Long Trumpet Horns w/HVY Duty 12 V Compressor Kit, 10 Pack FIAMM horn encompasses a combination of heavily chrome plated brass and stainless steel The FIAMM Big Boss is powered by a 12 volt maintenance free compressor, this horn truly is the boss of the road! FIAMM horn Installation kit includes 12 volt maintenance free compressor, relay tubing, and mounting hardware. FIAMM horn is easy to install and can replace your original horn