A bone folder tool is used as an accessory for hand-folding and scoring/creasing paper and cover stock materials. It is a handy way to make a straight dent (called a crease, or a score line) along a sheet, making folding thick stock easier. As an alternative to creasing and scoring machines, these bone folding tools are also a great tool for making your own pads of paper, and so much more. Folding bones are made of genuine bleached bone, but never from endangered species' or ivory.