These are two Dual SD12 500 watt high performance 12 inch car audio subwoofers. Featuring a single 4 ohm voice coil, these 12 inch subwoofers can handle an amazing 1000 watts of total power (350 watts RMS). The brushed chrome polypropylene cone not only looks great, but it is also stitched to a fairly large black foam surround, which promotes strength and also gives it a high-excursion. The black stamped steel basket and the oversized 38 ounce magnet, allows these subwoofers more durability, cooler temperatures and superior power handling capabilities. Featuring a "Mid-Q" design, this design allows these subwoofers to be mounted in a sealed box or a ported subwoofer enclosure. These subwoofers has been remanufactured to 100% of Dual's original factory specifications.