When a frame combines materials, classification follows the material of the front (the part that holds the lenses) under the general rules of interpretation, or the material that gives the frame its essential character. A metal front with plastic temples is typically classified as a frame of metal (other than plastics) under 900319. Documenting the material breakdown supports the classification decision.

Many eyeglass frame tariff lines originating in China are subject to Section 301 measures. The specific measure and any applicable exclusions attach at the 10-digit HTS line level, so importers should verify the current status of their specific line with CBP or a licensed customs broker before entry.