There are two kinds of lace card: one is a piece of pierced cardboard or more usually, waxed paper or parchment used to make lace, with perforations for lacemaking pins, guide lines, and sometimes other instructions. The other is a lacy-looking punched card with all its holes punched out, thereby producing a card with severely reduced integrity which can collapse and jam in card readers and other machinery. Old punch cards make excellent cards for making lace, if they haven't been used first.