Superior Threads - SuperBOBs M Style.#601 Yellow. Price is for 1 unit of Superior Threads SuperBobs Bottom Line Embroidery Thread M-Style Cardboard 215 yds Bobbins 12-Pack; 601 Yellow M-12-601 Bottom Line is made from 60 wt./2-ply Lint-Free Filament Polyester Ideal for hand and machine applique, detail quilting, embroidery, stitch-in-the-ditch, bobbin thread, trapunto, binding, free standing lace, heirloom sewing, serger thread, and garment construction Home Machines: Topstitch #70/10. Set tension to 4.0 Longarm Machines: #14 (MR 3.0)