6003.40 - Of artificial fibers:

This HTS classification covers knitted or crocheted fabrics with a width not exceeding 30 centimeters, specifically those composed of artificial fibers. These fabrics are distinct from those made from natural fibers like wool or cotton, and also differ from those derived from synthetic fibers. The primary distinction lies in the material composition, focusing on manufactured fibers that are not classified as synthetic.

Within this category, a further distinction is made based on the construction and further characteristics of the fabric. The subcategories differentiate between open-work fabrics that are warp-knitted, providing a specific structural classification, and "other" fabrics that do not fall into that more defined construction. This allows for granular classification of a wide range of narrow knitted or crocheted fabrics made from artificial fibers.