Sycho Sound New Single Car Black Subwoofer Box Ported Automotive Enclosure for 12-Inch Woofer 12SP 12" woofer hole is 11" in diameter, built-in spring loaded terminals, fits most cars High quality MDF hardwood, enclosure volume is 1.49 cubic feet, height 13" x length 18" x depth 16", speaker mounting depth is 14.5" Ported for fuller bass response, made of only the best black aviation carpet Ships fully assembled, simply drop in your woofer Applications: car, truck, SUV or fixed installation speakers