Rockville 12" Sub Box for 1999-2006 Chevy Silverado 1500 Xcab/99-06 GMC Sierra Rockville 12" Sub Box for 1999-2006 Chevy Silverado 1500 Xcab/99-06 GMC Sierra Proudly Made In The USA, Using Only The Finest Quality Materials - For The Best Level of Performance From Your Subs! 5/8" USA Heavy Duty MDF Construction Machine precision cut mounting holes. Top of the line Glue for extra durable adhesion, High quality spring loaded terminals Designed, tested, and engineered to work with most of todays popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system. Rockville 12&#034; Sub Box for 1999-2006 Chevy Silverado 1500 Xcab/99-06 GMC Sierra Proudly Made In The USA, Using Only The Finest Quality Materials - For The Best Level of Performance From Your Subs! 5/8&#034; USA Heavy Duty MDF Construction Machine precision cut mounting holes Top of the line Glue for extra durable adhesion High quality spring loaded terminals Designed, tested, and engineered to work with most of todays popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system. Type of Enclosure: Sealed Enclosure Sub Size: Dual 12&#034; Dimensions in Inches: 9.5&#034; L x 51&#034; W x 15.25 H&#034; Mounting Depth: 5.5&#034; Mounting diameter (hole size): 11&#034; (inches) Wood thickness: 5/8&#034; (inch) Air Space: 0.95 Cubic Feet Material: Highest-grade MDF wood on the market