12mm White Cotton Covered Plastic Boning Easy Sew.  20 metres.

Created especially for when extra stiffness is required for shape and support. 

Twill covered boning is used for stiffening dresses, corsets, hoops, crinoline petticoats, fancy dress costumes, swimwear, underwear and wedding and evening dresses.  This twill boning is stronger than polyester boning, but not as heavy as the synthetic whalebone type.