Best-Rite ABC Classroom Dry Erase Porcelain Steel Magnetic Markerboard, 4 x 4 Feet Whiteboard (2H2ND-25) Magnetic porcelain steel whiteboard surface is permanently laminated to a light weight substrate for stability and durability.Magnetic porcelain steel whiteboards are engineered for superior color contrast with dry erase markers. Standard gloss dry erase surface provides superior writability and erasability with no ghosting. Anodized aluminum ABC Trim has a .88" profile with aluminum molded corners. Full-length accessory tray includes plastic end caps to eliminate sharp corners. Class A Fire Rated board. A full test report copy is available upon request. Fifty year guarantee. Has achieved GREENGUARD GOLD Certification. Mounting L-Clip hardware included.