Machine Embroidery Thread Set - 80 Colors of Polyester on 500M Spools - Sets A&B - ThreadArt Our polyester thread offers excellent performance for high-speed embroidery machines. Set of 80 popular colors of embroidery thread on 500 meter (550 yards) spools. High sheen machine embroidery thread. 40 wt. trilobal polyester. Outstanding tensile strength and color-fastness. Spool design for this set includes snap style thread holder on bottom of spool. The spools will fit all embroidery machines including cartridge style thread holders.