8.0 ft l, 4.0 ft w, 12.000 in. Thk; 0.187 in. Thk ferromagnetic stainless steel working surface w/low reflective finish and drilled and tapped with 1/4-20 mounting holes on 1.000 in. Centers; steel honeycomb core, 14.0 lb/ft density, 0.4 sq in. Cell area; flatness porm 0.003 to 0.005 in.; internal damping system