We offer you the choice of either regular or acid-free foamboard. Our acid-free foamboard offers the best protection for all your mounting and backing projects. The facing paper on both sides of the board has a pH of 7.3-8.5 and is buffered to maintain its pH level. The inert core is made of extruded polystyrene. If regular foamboard is all your needs require, we've got you covered there with a wide range of sizes and thickness. Looking for black foamboard? We have that too. It has both a black board with a black core. Sheet sizes of 40" x 60", 48" x 96" and 48" x 120" ship via truck line only.