USDA APHIS has jurisdiction over animal byproducts, including swine-derived bristles, and may impose conditions based on the country of origin and the processing method applied. Bristles that have been thoroughly cleaned and treated are generally lower risk, but importers should verify current APHIS requirements for the specific origin before shipment.

Heading 0502 covers only the raw or minimally prepared bristle and hair material — not assembled brushes. Once bristles are incorporated into a brush or broom, the finished article moves to Chapter 96 (miscellaneous manufactured articles). The key question is whether the bristles have been assembled into a brush head or handle.