Nielsen Bainbridge 4000 mechanical board (formerly Letramax) offers superior performance with all studio materials including tech pens, airbrush, and all types of adhesives.  Inking produces consistent and exceptionally sharp lines against the bright white surface, giving enhanced contrast between ink and paper.  Ink lines can be easily erased without affecting the original inking capabilities of the board.  Brad Buslik says the surface can be stripped off the backing board for laser scanning or repositioning sections of art.  Sold in carton quantities only. Size 30 x 40 is oversized.  Extra shipping fees apply after checkout.