Section 07 Plastics and articles thereof; rubber and articles thereof 39 Plastics and articles thereof 39 17 Tubes, pipes and hoses, and fittings therefor (for example, joints, elbows, flanges), of plastics 39 17 10 - Artificial guts (sausage casings) of hardened protein or of cellulosic materials Commodity Code Description 39 17 10 00 - Artificial guts (sausage casings) of hardened protein or of cellulosic materials