Up for sale http://doiop.com/2idpi9 is used ALVIN PXB Portable Parallel Straightedge Board used by an Engineering student. . This board provides the convinence of a studio work surface in a compact, portable unit. Each PXB is made from a smooth warp-free white Melamine laminated board and is equipped with a carrying handle, non-slip tractor feet designed to grip the table edge at the perfect drawing angle, foldaway ledgs, and an acrylic straightedge w hose height can accommodate material thicknesses up to 3/16". It comes fully assembled. Size is 18 x 24. this unit sells for $100. Here are some Pictures of the board