Industry experts calculate that one 1,500 yd. maxi spool of 40 Wt. Rayon thread can create 273,000 stitches. This is a great size when you need a little more and you still need it to store well. Nothing is worse than running out in the middle of a big project! Sulky 40 Wt. Rayon embroidery thread has the same luster and soft, warm, natural look as silk with silks smoothness, but it is stronger and less expensive. The vast majority of embroidery designs are digitized for Sulky 40 Wt. Rayon thread. Because of its excellent runability, unparalleled quality and huge selection of colors, Sulky is, and always has been, the first choice of machine embroiderers. Only Sulky Rayon threads are made exclusively from ENKA fibers, proven to be the highest quality rayon/viscose fibers in the world.