Machine Embroidery Thread Set - 160 Colors of Polyester on 500M Spools - ThreadArt Our polyester thread offers excellent performance for high-speed embroidery machines. Set of 160 popular colors of embroidery thread on 500M Spools. High sheen machine embroidery thread. 40 wt. trilobal polyester. Outstanding tensile strength and color-fastness. Each spool has snap style thread holder on bottom.