5107 - Yarn of combed wool, not put up for retail sale:

This HTS category, 5107, encompasses yarn spun from combed wool that is not packaged for direct sale to consumers. Combing is a process that aligns wool fibers, resulting in a smoother, finer yarn compared to worsted or carded yarns. The key defining characteristic here is the material: wool, processed through combing.

Distinguishing this category from its siblings within the broader HTS system is crucial. While other Chapter 51 headings might cover raw wool, coarser animal hair yarns, or woven fabrics made from such materials, 5107 specifically addresses combed wool *yarn* in bulk quantities, intended for further manufacturing or industrial use rather than final retail. For example, siblings in Chapter 01 cover live animals, which are entirely different goods, while other headings within Section XI will address different stages of textile production or different types of fibers.

The subcategories within 5107 provide a vital distinction based on the wool content. Heading 5107.10 applies to combed wool yarns where the wool constitutes 85 percent or more of the total weight. Conversely, 5107.20 is designated for combed wool yarns containing less than 85 percent wool by weight, indicating the presence of other fibers blended with the wool. This differentiation is critical for accurate duty assessment and trade statistics.