2 Kicker 12" Subwoofers + GMC Chevy Silverado Ext Cab '99-06 Box + Amp + Wiring CompC 12 inch 600 watt (per subwoofer) 4 Ohm voice coil SVC subwoofer 600 watts max per sub, 300 watts RMS per sub High performance bass that keeps pounding Specifications: Size: 12 inches