17 Semi-worked polymer resins in the form of cladding for rollers; rubber and plastic roller cladding for rollers; sleeves for protecting parts of machines, in particular rollers; sleeves of rubber and plastic for rollers, tubes and pipes; elastic sleeves; rubber, gutta-percha, gum, asbestos, mica; profiles and other extrusion products of rubber or plastic; non-reinforced rubber hoses; plastics in extruded form for use in manufacture; semi-processed polymer resins; packing, stopping and insulating materials; flexible pipes, not of metal.