Scosche SEV122CC 12-Inch Slot Ported Dual Subwoofer Enclosure (Grey/Black) " Medium density fiberboard front baffle and recessed side panels for easy lifting 100% Sealed joints and pre-cut 11" diameter hole Nickel plated spring loaded speaker terminals Pre-wired with fast-on terminals with poly fiber lining damper 2 x 1.67 cu. ft. internal volume