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. or 7 3/4"dia. with 1"dia. titanium/PEI tweeter to provide great sound quality. Power handling is 50W (RMS)/100W (Peak). 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