The FIAMM Hidden Horns blend neatly with todays cleaner, sleeker boat designs. Made with top-of-the-line materials and workmanship, these USA manufactured horns will provide years of trouble free operation and the best sound quality available in the market. All FIAMM Marine horns meet or exceed ABYC, NMMA and Coast Guard requirements and are NMMA type accepted. This horn produces 125 dB at 4".