Soundstream RBW12 12-Inch 600-Watt Subwoofer (Black) Dual 4 Ohm KEISV Kapton Voice Coils Polypropylene Injection Molded Cone NBR-Rubber Surround Nickel Plated 8 ga. Compression Wire Terminal Conex/Cotton Composite Spider Texture Coat Finish on Stamped Steel Basket Suspension Integrated Tinsel Leads Vented Back Plate