The standard of the framing industry! 24 x 36 inch (61.0 x 91.4 cm) foamboard, 3/16ths inch (4.8 mm) thick, clay-coated board on both sides. Our regular black foamboard is now ACID-FREE at NO EXTRA CHARGE! This product is black on both sides, with a black foam core. This is a full case of 25 sheets. Save big by buying in full cases. (At this time, we only sell foam board in case quantities.) Made in USA.