MB Quart RWM252 Reference Dual 2-Ohm Subwoofer, 350W 10-Inch Thermal formed polypropylene cone 2" high-temp voice coil Heavy duty textured powder coat finish Deep drawn heavy gauge stamped steel basket Dual mirror image treated spiders Thermal formed polypropylene cone, 2" high-temp voice coil, Heavy duty textured powder coat finish, Deep drawn heavy gauge stamped steel basket, Dual mirror image treated spiders