Rockford Fosgate M2 M282B Marine Grade 8-Inch  Coax Component Speakers Black Injection molded mineral filled polypropylene cone UV and salt-fog resistant TPE (thermo-plastic elastomer) Surround 1" Bridge mounted component grade coated aluminum alloy tweeter Eight-inch, 4-ohm marine coaxial with 200 watts maximum power handling (100 watts RMS) Injection molded mineral filled polypropylene cone body with TPE surround One-inch (25mm) bridge mounted component grade coated aluminum alloy tweeter Corrosion, moisture, and UV resistant for true marine-grade compliance 48Hz - 22kHz frequency response