Polk Audio AA2653-A MM6501UM 6.5-Inch Component Ultra Marine Speaker Completely Sealed front design prevents water intrusion. Rugged, Built-On Grille Includes Tweeter Mount eliminates the need for a traditional tweeter post. Sealed Crossover Assembly Built Into Back of Magnet means theres no need to find room to hide an extra box. Steel Heavy Duty Input Terminals will not corrode or tarnish. Passes The Most Rigorous 600 Hours of Salt Fog and UV Testing (ATSM B117-03 Standard Practice for Operating Salt Spray (Fog) Apparatus, and D4329-99 Standard Practice for Fluorescent UV Exposure of Plastics).