The Elmer's Alvin Foamboard 30X40 25 Shts 3/16 is lightweight but sturdy making it extremely resistant to rippling, denting or crushing. Designed specially for framing and graphic design use this durable and smooth board is perfect for silk screening, mounting, framing and so much more. Great for the experienced artist or the home crafter. You can use the Elmers foam board for crafts and school projects as well. The smooth surface works great with different mediums like paint and markers. Standard foam board is 3/16" or 5mm thick and 30"/40". Oversized shipping cost is $27.50.