Rayon NO. 40 1100yds - Pale Sea Foam - 1071 Madeira Rayon No. 40 is the No. 1 thread chosen by professionals for their embroidery machines. High tensile strength and exceptional color fastness give consistency and longevity to Rayon and make it ideal for embroidery on today's sophisticated computerized machines. Perfect for quilting, decorative stitching and embellishment. It can be used on all fabrics from the finest silks to the toughest leather or denim.