Madeira Rayon 40 Wt. is the classic of all embroidery threads. Classic Rayon, made of eco-friendly viscose, has a unique, tight twist of 40 wt/2 ply viscose filament that creates a wonderful lustrous sheen and is suitable for all types of embroidery. It has a soft, vibrant, silky appearance which is perfect for quilting, decorative stitching, and embellishment. Its high tensile strength, combined with soft texture can accommodate applications on finest silks to the toughest leather or denim. They are wound on a thread locking spool. 200m (220yds) per spool. Due to their superior quality and color fastness, Madeira rayon embroidery threads can be washed at 203ºF with heavy duty detergents. (Use only those which contain no bleaching agents, peroxide, or optical brighteners as discoloration may result.)