4102.10 - With wool on:

This HTS category, 4102.10, specifically covers raw sheep or lamb skins that still retain their wool. These skins are considered "raw" because they have undergone initial preservation treatments such as salting, drying, liming, or pickling, but have not yet been tanned or further processed into leather. The presence of wool is the defining characteristic for classification under this heading.

The key distinction of 4102.10 from its sibling category, "Without wool on" (4102.20), lies solely in the presence or absence of wool. Both categories pertain to raw sheep and lamb skins, but 4102.10 is exclusively for those where the wool is still attached. This differentiation is crucial for accurate customs declaration and duty assessment.

Within this category, further subdivisions exist to refine the classification. Subcategories like "Not pretanned" and "Other" provide for more granular distinctions based on the degree of processing or specific characteristics of the wool-on sheep/lamb skins. These subcategories allow for precise identification and statistical tracking of these raw materials within international trade.