The Demon Model 730 features flat rack detachable design, spun steel trumpets (18.25, 14.75, 10.5) for extreme flow and a heavy duty brass solenoid valve. This is the loudest, largest and most aggressive train horn on the market, bar none. XCR 2.0 -coated black coating ensures that they'll withstand heat, sun, UV & salt spray. Fully upgradeable with our Ultra BlastMaster P/N 6890 for a truly earth-shaking experience.