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 along a sheet, making folding thick stock easier. They 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. You can buy bone folders online from Binding101 in a variety of sizes and shapes, including either 8" or 9" lengths and with either rounded or pointed edges.