Raw or insufficiently processed bovine hides can carry foot-and-mouth disease virus and other pathogens, so USDA APHIS imposes country-of-origin restrictions and may require that hides be treated (e.g., dried, salted, or pickled to specified standards) before entry. Importers must verify current APHIS regulations for the specific country of origin, as admissibility conditions vary and can change with disease-status determinations. Working with a licensed customs broker and obtaining any required import permits in advance is essential.

The heading uses the dried weight of the hide as the primary measure: hides at or below 8 kg when dried (or 16 kg when fresh/wet-salted) are classified as lightweight under 410120, while those exceeding 16 kg fresh are heavyweight under 410150. In practice, tanneries and hide traders weigh hides in their preserved state and apply conversion factors; the CBP ruling record and industry practice guides on moisture content are useful references when the weight is near the threshold.