Kleinn Air Horns 130 Mini Triple Train Horn - Chrome-Plated Zinc Alloy Triple Air Horn Trumpets, 14-1/4-Inches, 11-1/2-Inches and 9-1/4-Inches Loud, Sharp, Blended Sound Chrome Plated Zinc Alloy Air Horn Trumpets Requires 150-PSI Onboard Air System (Not Included) Up To 152.9 Decibel Output