6-1/2'' (160mm) Dual-Cone Marine Speaker with integrated grille assembly, rubber surrounds, Polypropylene Woofer Cone and cast-polymer Basket. The JBL MS6100 marine loudspeaker was designed specifically for marine applications. A waterproof motor structure, sealed cones, and integrated grilles ensure that these speakers will stay alfoat for years. Sealed magnet structure protects the motor structure from water. One-piece cast-polymer basket holds up, even after excessive exposure to sun and salt. Stainless-steel mounting hardware included.