Gutermann Silk S303 sewing thread, 100m spool, colour number 586 Natural thread made of 100% silk Universal sewing thread for both hand and machine sewing Ideal for use as a bobbin thread with R753 silk as a needle thread Great for closing and backstitch seams as well as decorative seams Thickness Ticket No. 100 Suitable for all fabrics, woven fabrics and other materials Recommended Needle - Universal NM 70-80 Sweet Peach Gutermann silk S303 universal sewing thread is a natural thread made from 100% silk. It provides a wonderfully elegant sheen in sewing and can be used for many applications including closing and backstitch seams, decorative seams and ornamental stitches. A versatile thread type that can be used with all fabrics, woven fabrics and other materials. Suitable for washing at 40°C, dry cleaning and medium heat ironing. Do not tumble dry or bleach.