. The Bottom Line is a 60 wt. lint-free filament polyester. It is a versatile thread which can be used in many applications. It is ideal for hand and machine applique detail quilting, embroidery, bobbin thread, binding, and much more! It is a wonderful thread choice for micro stippling. Its silk-like finish allows it to slide, not grab, to form the perfect stitch. Available in 55 colors. 1420yd spools.