Q Power QBGMC1220144DR Dual 12" Subwoofer Enclosure Box for 2014-2016 Chevy Silverado and GMC Sierra Crew Cab Trucks Fits 2014-2016 Chevy Silverado and GMC Sierra Crew Cab Trucks - Does Not Fit Double Cab Models Dual 12" Sealed Down Firing Unloaded Subwoofer Box Constructed Out of High Grade Premium MDF Wood Features a Spray Liner Finish for Maximum Strength and Durability Down Firing Subwoofer Enclosure Design