100% polyester, size 50, it's name already tells what's all about: this is the par-excellence universal floss, expressly developed to cope with any kind of fabric and sewing. Whether hand or machine sewing, whether dealing with silk, flax, viscose, cotton, any kind of synthetic fiber, denim and even leather and leatherette, no problem, thanks to its high resistance! It can be washed with temperatures up to 95°C or dry washed, thanks to it solid colors (up to 400 different ones, following the length of the spool) and to its 100% resistance against wrinkling. 100-meter spools.