Input-output norms for sports ball imports require imported components to match those used in the exported product. Input-output norms specify permissible components for certain sports balls-synthetic rubber nitrile/SBR bodies with cotton or polyester/viscose fabric layers and butyl or latex bladders-and list constituent inputs (fabric per layer, bladders, adhesive, ink) that may be imported. Administrative action has suspended or deleted some listed items by public notice. Importers must ensure imported goods match the inputs used or required in the exported product, and the proportion of various inputs will be determined and verified under the policy.