Made of mica-polypropylene, these marine speakers are built for added protection against the elements associated with boating. Marine coaxial speakers feature santoprene surround and are available in two woofer sizes, 6 1/2"dia. with 1"dia. titanium/PEI tweeter to provide great sound quality. Power handling is 50W (RMS) and 100W (Peak). Subwoofers are designed to withstand vibration and temperature changes, as well as exposure to moisture and salt air. Style: Flush mount Impedance: 4 ohms Cone: Mica-injection polypropylene cone woofer; titanium/PEI (Polyetherimide) tweeter Magnetic Shielding: No Waterproof Rating: Water-resistant Warranty: One year