Best-Rite Classroom Deluxe Porcelain Steel Dry Erase Whiteboard, 4 x 4 Feet Magnetic Markerboard With Aluminum Trim & Map Rail (202AD-25) Porcelain steel dry erase whitebaord surface is permanently laminated to a light weight substrate for stability and durability. Includes a full-length tackable map rail with a colored cork insert, and a full-length accessory tray with rubber Dura-Safe end caps to eliminate sharp edges. The surface doubles as a magnetic bulletin board. Class A Fire Rated board. A full test report copy is available upon request. Fifty year limited warranty. Has achieved GREENGUARD GOLD Certification.