Power Acoustik PEN-12W  4 Ohm 12" Subwoofer  800 Watts MAX  Butyl-Rubber Surround  40oz Magnet w/ Vented Back Plate 800 Watts MAX 40oz Magnet w/ Vented Back Plate Butyl-Rubber Surround 2 4-Ohm 4-Layer ASV Voice Coil Quick Disconnect Wire Terminal