Martin Universal Design Pro-Draft Parallel Straightedge Board, 20" x 26", White Melamine, 1 Each is the only parallel straightedge board utilizing an anti-warp aluminum body straightedge for strength and stability. Features folding rubber tip legs and non-skid rubber feet. Also includes deep ribbed strips so that the unit can be adjusted over the table edge to bring the artwork into the users lap. Each side of the unit has large knobs for adjusting the straight-edge to align with the artwork/drawing and stay parallel. High resin particle board to prevent board breakage. Includes comfortable easy-to-grip handle for easy transport.