Bbox A134-10CPV Single 10" Vented Carpeted Subwoofer Enclosure - Fits 2014-2017 Chevrolet/GMC Silverado/Sierra Extended Cab Fits 2014 & Up GM Extended Cabs - Custom Under Rear Seat Application MDF Construction with Glued and Braced Assembly Premium Carpeted Finish with Rounded Edges 0.90 Cu. Ft. Air Space per Sub / Tuning 39Hz 6.25-Inch Mounting Depth