This extra strength tape is tubular to encase your spring steel and spiral bones in dresses and corsets. Washable (do not machine wash metal bones -- hand wash or dry clean those). Choose from white or black in our drop-down menu. This casing is perfect for use our 1/4" spiral bones and our 1/4" and 5/16" spring steel bones. Choose white or black from the drop-down menu. Wholesale Casing Tape for Boning - 1/2" (13mm) wide. #34-7212. Priced per 50 yard roll. Choose from Black or White.