These TWO QPOWER QTW12 Single 12" Sealed Car Audio Subwoofer Box Enclosures feature solid 5/8" MDF construction, charcoal carpet covering, terminal cup connectors, 0.9 cubic feet of air space per Box, and a mounting depth of 6-inches. Turn your ride into a sound machine with the help of the QPOWER QTW12 Single 12" Sealed Car Audio Subwoofer Sub Box Enclosures!