Formerly known as Metrocor. Seracor is a 100 Polyester Corespun Serger and Long Arm Quilting Thread. Can also be used for General Quilting and Sewing. Optimal elongation, exceptionally smooth and shrink proof. 2500m2734 yds per cone. Available in 50 colors. Recommended needle size 7080. Matt finish. Tex 24. Strength 120. 2ply. 50 weight.