Vouwbeen

folding bone is a dull-edged hand tool used to fold and crease material in crafts such as bookbinding, cardmaking, origami, and other paper crafts that require a sharp crease or fold.

Often made from the leg bone of a cow, deer, or similar animal, alternatives made from plastic now exist. However, those made from bone may be less likely to leave residue on the workpiece.^[6]

In Japan, the equivalent folding tool is traditionally made from bamboo, although alternatives include a Japanese fabric marking tool (hera) and a Western bone folder.^[7]