100% polyester. For all materials and threads. For sewing with a sewing machine and by hand. No thick and thin areas, optimum sewing security. For closing and quilting seams. For over lock and safety seams. For button holes and for sewing on buttons. For fine ornamental stitches and decorative seams. Recommended needle and needle size: universal needle NM 70 - 90. Earn Loyalty Reward Points on all Gutermann threads. FREE Delivery Options are also available.