Package: Kenwood Kfc-w12 12" 4 Ohm Car Subwoofers with 2000 Watt Peak / 400 Watt RMS + Atrend Dual 12" MDF Vented Subwoofer Enclosure + Dual Sub Box Enclosure Kit with 14 Gauge Speaker Wire + Screws + Spade Terminals 12" 1000 Watt Subwoofer Dual Magnet Drive Volume per sub: 1.55 cubic feet Multi layers of high-grade glue ensure long life and no air leaking out