Lanzar OPTI1222D Optidrive 12-Inch Die-Cast Aluminum Alloy Cone Dual 2 Ohm Subwoofer Custom Tooled Die-Cast Aluminum Basket Aluminum Alloy Cone Structure Massive Butyl Rubber Surround 2.5 High Temperature Dual Voice Coil 65 Oz x 2 High Density Barium Ferrite Magnet