POWER HANDLING, PEAK 200W * MAGNET STRUCTURE, 40 Oz; IMPEDANCE 4 or 8 OHM; FREQUENCY RESPONSE, 40HZ-20KHZ * SPL 1 WATT/1 METER, 94dB; CONE MATERIAL, POLY * VOICE COIL, 1-Inch ALUMINUM; TWEETER 1-Inch MYLAR DOME; GRILLES, METAL * FERRO FLUID ENHANCED * Car Audio * Speakers * Boss Audio MR30 White Box Speakers. * These enclosed speaker systems incorporate all the water resistant technology of our other marine speakers: composite polymer frames, polypropylene cones, rubber surrounds and coated leads. * With audio performance you would expect from a high end home speaker you can mount these in any marine location.