Q Power QBGMC1020144DR Dual 10" 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 Extended Cab Models Dual 10" Sealed 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