All black anodized finish. CNC machined billet 6061-T6 aluminum. As a direct replacement for the OEM horn. Wiith 110 dB which is louder than stock. Diameter 150mm.. Note: Arlen Ness horns can be style matched to other Arlen Ness components like air cleaners foot pegs grips gas caps head lamps etc. 91-23 Big Twin with side mounted horn