COATS & CLARK-Susan Bates Plastic Bone Rings. Molded from a sturdy, wear resistant, and dry cleanable plastic, Bone Rings are opaque white circular rings that are suitable for crafting projects. Available in a variety of diameters, Bone Rings are the excellent foundation for creating buttons on knitted or crocheted garments, jewelry, cafe curtains or rings on pot holders. The uses are endless for this handy accessory. Imported.