These Gutermann Sew All Threads are suitable for all materials and threads and for sewing with a machine or by hand. There are no thick or thin areas. They’re perfect for closing and quilting seams and overlock and safety seams. Ideal for button holes and sewing on buttons and other embellishments. They’re also great to use for fine ornamental stitches and decorative seams.Recommended needle and needle size: Universal Needle NM 70 – 90.100% Polyester.