Our Invisible Thread Poly and Topstitch Needles bundle includes a 1,500-yard spool of our very fine polyester monofilament thread and a 5-needle pack of #70/10 Titanium-coated Topstitch Needles. Invisible Poly is ideal for machine appliqu, free-motion quilting, stitch-in-the-ditch, echo quilting, and any technique where stitches should be hidden or secondary to the fabric and design. Loosen your top tension to 1.0-2.0 and use a Topstitch #70/10 needle for optimal results.