RT/OBCON - 2011 Chevy Silverado and GM Sierra 1500 Extended Cab Dual 10" Sealed Speaker Box Designed for: 2011 Chevy Silverado 1500 and GM Sierra 1500 (DOES NOT FIT HD MODELS) 53" wide x 12" deep x 7" tall - Premium 5/8" MDF "Tri-lock" joint construction (caulked, glued, and stapled) Speaker mounting depth: 5 3/4" - Air Volume: 1.00cf Sealed enclosure design (downfire)