The Bottom Line is a 60 wt./2-ply Polyester thread which makes a fantastic bobbin thread for any type of sewing. Its lightweight, blending colors are easily matched with any top thread. Invisible appliqué and binding is a breeze with Bottom Line as it glides through layers of fabric. Bottom Line is fantastic for micro-stippling and English paper piecing. We recommend a Topstitch #70/10 Sewing Machine Needle. Set tension to 4.0