Subheading 391610: Ethylene Polymers; Monofilament, of Which any Cross-sectional Dime … etc.
Subheading 391620: Vinyl Chloride Polymers; Monofilament, of Which any Cross-sectiona … etc.
Subheading 391690: Plastics; Monofilament, of Plastics N.E.C. in Heading no. 3916, Cr … etc.