OMG!!! 18" subwoofer with Carbon Fiber Cone and dust cap. It has a aggressive fat surround that is glued and double stitched. This subwoofer has a 4" voice coil that is black anodized flat wound, 10" double layered Nomex spider, triple stack 1" ferrite magnets. 5000 watts RMS. Please break this sub in for about 13 hours before full tilt.