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Speaker baskets and grilles made of UV-resistant fiber-reinforced ABS plastic. MARINA-R woofer with polypropylene cone. 1″ tweeters with titanium dome. MARINA-R crossovers with special protective sealing lacquer and gold-plated terminals to resist corrosion. Voice-coils protected against direct water spray. Sealed solder joints. Stainless steel V4A mounting screws included. Separate mounting gaskets.