This Powerful Train Sound Air Horn is made entirely of metal, in black color. Comes with a 1.5 (6 liter) air tank, 150 PSI 12 volt Heavy Duty Air compressor, 0-to-240 PSI air pressure gauge, air pressure switch, mounting hardware, hose, fittings, Teflon tape sealer, instructions, and a FREE horn button. Air horn system will produce a very loud train sound, and surely will get anybody's attention around you. Great for SUV's, trucks, RV's, pick-ups, Boats and many more applications. Air horn dimensions: L 19-1/4" x W 18" x H 7-1/2". Tank/Compressor dimensions: 16" L x 11-1/2" H.