Bottom Line Thread from Superior Threads is a 60 wt. lint-free polyester. Ideal for quilting, embroidery, bobbin, binding and applique. This thread can be used in a machine in both the top and bobbin and has a silk like finish. It is becoming favourable for hand applique as the fine 60wt thread disappears into the fabric resulting in perfect curves and sharp points. The lint-free, ultra-smooth surface prevents snagging and knotting.