Polk Audio 6" x 9" 3-Way & 6.5" 2-Way Car/Boat/Marine Coaxial Speaker (2 pairs) Dynamic Balance polymer/mica composite mineral filled cone is stiff yet lightweight for big sound and little distortion Marine Certified, perfect for use in marine vessels Low-mass 2-Layer 25mm Kapton voice coil former is lightweight for high sound output High Pass and Low Pass Crossover Filters ABS Grilles, computer optimized and based on exclusive MOMO designs