Armor Coated With High Pressure Polyurethane Bed Liner Material Increases The Base up to four times stiffens the wood and no air leaks Fits Most Hatch Backs or Trunks 1-12'' Speaker Air Volume 1.25 Cubic Feet Dimension 16''W x 19.5''BD x 16''TD x 14''H Material 5/8'' M.D.F