4101.90 - Other, including butts, bends and bellies:

This HTS category, 4101.90, encompasses a broad range of raw hides and skins from bovine (including buffalo) and equine animals that do not fit into the more specific classifications of whole hides and skins based on weight and preparation. This includes pieces of hides and skins such as butts, bends, and bellies, as well as any other raw bovine or equine hides and skins that are fresh, salted, dried, limed, pickled, or otherwise preserved but have not undergone tanning or further preparation.

It is crucial to distinguish 4101.90 from its sibling categories. HTS codes 4101.20 and 4101.50 specifically cover "whole hides and skins," differentiated by their weight thresholds. Category 4101.90, in contrast, is for those raw hides and skins that are not whole, or are whole but do not meet the weight criteria for 4101.20 or 4101.50. This category functions as a residual classification for raw, untanned hides and skins of bovine and equine animals.

The subcategories under 4101.90 further refine the classification. For instance, "4101.90.10" specifically addresses hides and skins that have not been pre-tanned, indicating a distinction based on the initial stages of processing. The existence of an "Other" subcategory suggests that further subdivisions may exist to capture specific types or preparations of these raw materials that are not otherwise delineated.