Clay-coated smooth surface is ideal for all framing and mounting applications. Acid-free for archival use. Light weight, yet rigid construction resists warpage. Cut clean edges with any utility knife. Its smooth rigid construction makes it a perfect choice for presentations and frameless mounting. Bainbridge white foamboard is white on both sides, CFC-free. Available in the most popular frame sizes. Foam board measures 3/16" (5 mm) thick.