Specifications: Black colored polystyrene foam core with black paper liners on the both sides. Used for photo mounting and picture framing. Acid free Ph 7~8. Thickness : 3, 5, 10mm (1/8", 3/16", 3/8", 1/2") Sizes : 700 x 1000mm, 1000 x 1400mm, 1000 x 2000mm, 1220 x 2440mm (48"x96"), 1016 x 1524mm (40"x60"), 813 x 1016mm (32"x40"), 762 x 1016mm (30"x40"), 610 x 915mm (24"x36") Packing : 3mm - 40pcs per carton 5mm - 25pcs per carton 10mm - 15pcs per carton 12mm - 15pcs per carton