Boss MR100 10-Inch Marine Subwoofer Polypropylene cone KAPTON voice coil Mounting depth - 4-5/8" 10-inch marine subwoofer delivers 600 watts peak power (300 watts RMS) at 4 ohms Polypropylene cone with rubber surround, Kapton voice coil former, 50 oz. magnet Moisture-proof construction with protective UV coating, chlorine resistance 25 Hz - 2.5 kHz frequency range; 94dB sensitivity One-year manufacturer's warranty