In wooden hand blocks used for printing on fabric the Gad is part of the set and is carved in intaglio style and used as the background filler. The asl or outline block fits within the outline printed by the gad block of the same set of blocks that form the pattern. There are normally two or more cylindrical holes drilled into the gad blocks thickness, connecting the upper surface to the carved lower surface. These holes free the air bubbles and excess printing paste while printing.