They are the el cheapo dual horns from Autozone parts store, they are bright red and I painted them with bedliner spray, even came with a relay, that I wired to the actual horn wiring instead of the switch wiring, this way I still have the stock horn in case I loose the pump, they are wired to the + pole that allows them to be activated without the bike being on.
Autozone airhorns = $29.95
Electrical supplys = $3.78
Scaring cagers with Ear bleeding sound = Priceless
HEAD