German Maestro MRC 6508 marine 2-Way coaxial speakers 6.5" (165 mm).

Speaker baskets and grilles made of UV-resistant fiber-reinforced ABS plastic
Insert injection-molded magnet systems for optimized protection against humidity and mechanical influences  
MARINA-R woofer with polypropylene cone 
0.75" tweeter 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