Madeira Classic Rayon #40 - 5500YD / 5000M Large Cone - Color 1440 - Cobblestone. Madeira's Classic #40 is the standard size embroidery thread and is ideal for most designs. Made from 100% viscose rayon, it is perfectly suited for embroidery on high speed multi-head machines. It is known worldwide for its high tensile strength and glossy luster.