150 oz. double strontium magnet for high power, high stroke, 600 watts max music power, Extra long throw excursion, Long dual 2 In. black aluminum voice coil for power handling control, Vented Magnet structure for better heat dissipation Non-pressed paper cone for more solid bass, higher SPL 2 In. butyl rubber surround for long stroke Chrome post terminals for better connection during hard hitting bass hrome basket Dual 4 ohm voice coil which maybe connected in parallel to create a 2 ohm subwoofer or series to create an 8 ohm subwoofer Rubber sealant gasket