Toys intended for children under 12 must be tested by a CPSC-accepted third-party laboratory and accompanied by a Children's Product Certificate (CPC) attesting compliance with applicable mandatory standards, including ASTM F963 (toy safety), lead content limits, and phthalate restrictions. Importers are responsible for maintaining test records and making them available to CBP and CPSC upon request.

Scale models and hobby kits marketed and sold exclusively to adults — not intended for children under 14 — may avoid classification as children's toys and the associated CPSC mandatory testing requirements. However, the article still falls under heading 9503 for tariff purposes. The CPSC age-grading determination is separate from the HTS classification; both must be addressed independently.