Standard Input-Output Norms for sports ball inputs require imported materials to match declared export manufacturing use. Standard Input-Output Norms set per-unit material composition and quantities for size-3 sports balls made of PVC/PU leather with specified bladders and layered fabrics, listing cotton fabric area, adhesive and solvent weights, bladder counts, ink and auxiliary weights, and thread length. Applicants must ensure imported inputs match those used or required in the export product; authorities will determine proportionate input usage for the manufactured resultant product as a verification and compliance measure.