Large staples found on corrugated cardboard boxes have folded legs. They can be made of plastic or cardboard. Printing can be done on various substrates, including paper, cardboard, and plastic. Materials such as plastic, metal, and even cardboard have been used in some instruments. More common are small seatings or little tables made from corrugated cardboard. Wood is pulped to make paper and cardboard. Thus, it makes a more uniform substitute for corrugated cardboard. There were 6 daily ration boxes per cardboard case. The show often had simple black light theatre segments using paper or cardboard cutouts. Contamination can occur from unwashed plastics and greasy cardboard or paper items. Crumpled newspaper, wool, rags, dry grass, sheets of cardboard, etc. Previously, deceased prisoners were buried in cardboard boxes. Many of them erected shacks made of tin, wood and cardboard. They were photographed mounted on large pieces of stiff cardboard. This was in place of the usual cardboard box.