Features:

• Trumpet Outlet Diameters:  6.50"
• Trumpet Lengths(3): 11", 13.1/2", 15.1/2"
• Material: Chrome All Metal Base/ CHROME Plated ZINC Trumpets(Non-Rusting)
• Mounting Hardware: Included w/Anti Vibration Pad
• Simple Connect Your Air Line-Hook up to the Solenoid
• Air Horn needs an air compressor to work which is  NOT included with this listing.