Madeira's #40 Weight Polyester embroidery thread is a standard weight for all types of machine embroidery. Made from 100% polyester, Madeira polyester embroidery thread is strong and constructed of a specially developed raw material intended to eliminate looping, puckering and thread breaks. Vibrant colors are glossy, as well as resistant to chlorine bleach, making this thread ideal for commercial linens or any application where the end product will be subjected to harsh laundering. It is Oeko-Tex® certified to be free from harmful substances. Madeira embroidery thread works great in both commercial and home high speed embroidery machines.