These plastic bones are sold by the coil and are of excellent quality. They are far superior, in our opinion, to Ridgelene. They come in four different widths, can be sewn through and are easily cut with scissors. The cut ends do not fray and any rough bit can easily be removed with a swipe of an emery board. They are unaffected by water which allows them to be used in swim wear or hand washable garments. German Plastic bones come packaged in 100 meter spools and coil up naturally due to this. When sliding these bones into a casing, alternate the direction of the arc/curve. If you slide all pieces into their channels with the curve going in the same direction you will get a "warped" garment, to avoid this effect alternate the direction of the curve of each bone. Boning Coils - 7mm (5/16") German Plastic Boning. Priced per 25 meter coil.