Priced per yard. Black. Bone Casing. 5% discount for 5-yard pack; 10% discount for 20-yard pack; 30% discount on 72-yard roll. 45% discount on 212-yard roll (200 meters).  For use with 1/4-inch bones.  Perfect for ballet costumes and any costume that is sweated in - gives another layer of fabric between the body and outer bodice fabric, so minimizes rust stains caused by steel boning becoming wet with sweat.