Input-output norms require imported inputs to match declared usage, affecting sports ball manufacture compliance standards. Standard input-output norms prescribe component composition and per-unit input requirements for manufacture of PVC/PU sports balls, listing outer leather cloth, fabric layers, bladder types, adhesives, thread, ink, thinner and hardener as normative benchmarks. Applicants must ensure imported inputs correspond to those actually used in the export product, and authorities will determine permissible input proportions and verify that imports match declared manufacturing usage for compliance.