Section 11 Textiles and textiles articles 50 Silk 50 06 Silk and spun yarn from silk waste, put up for retail sale; silk-worm gut 50 06 00 Silk yarn and yarn spun from silk waste, put up for retail sale; silk-worm gut. Commodity Code Description 50 06 00 00 Silk yarn and yarn spun from silk waste, put up for retail sale; silk-worm gut.