These 2 Q-Power QTW12 Single 12-inch Sealed Car Audio Subwoofer Box Enclosures feature solid 5/8-inch MDF construction, charcoal carpet covering, terminal cup connectors, 0.88 cubic feet of air space per Box, and a mounting depth of 5.5 inches. Turn your ride into a sound machine with the help of the Q Power QTW12 Single 12-Inch Sealed Car Audio Subwoofer Sub Box Enclosures!