Widescreen dimensions support the most popular sizes of projected images at diagonal dimensions of 84.9" (4’H x 6’W), plus many custom sizes available. The special construction of the board provides the flatness required for the best performance of your interactive projector, with a flatness guarantee lesser than 2mm across the board surface. This guarantee allows the board to be used on mobile carts or wall mounted, still achieving the projector manufacturer’s flatness requirements. Easily clean even stubborn permanent marker from the standard gloss white or matte gray surfaces. Low gloss white surface requires wet erasing please call before ordering. The surfaces are engineered to minimize visual strain from anywhere in the room, ideal for spaces that are exposed to ambient light. Magnetic surface provides even more versatility and the low profile aluminum Brio trim is a modern addition for your interactive spaces. Fifty year limited warranty.