Powerbass M154D 15-Inch  850 Watt Subwoofer 15-Inch 4-ohm Dual voice coil 425 Watts RMS 850 Watts max power handling Comes with mounting plate application guide with box building tips and Powerbass decal 2 Inch Vented BASV voice coil former Non-pressed paper cone with large roll Santropene Surround Black Emissive coated back plate and pole piece