Input-output norms for sports ball manufacture define component proportions and require imported inputs to be used in export production. Input-output norms specify per-unit consumption of materials for manufacture of PVC/PU sports balls (outer PVC/PU leather, polyester/viscose or polyester fabric layers, cotton layers, adhesives, butyl/latex/PU bladders, thread, ink, thinner, hardener). These norms serve as the operative basis for determining acceptable proportions of inputs used in export production. Applicants/importers must ensure that imported goods correspond to the inputs actually used or required in the exported sports ball product and that authorities may apply the listed proportions in assessment.