Bronze zips input-output norms require specified material ratios and that imported inputs match those used in exports. Input-output norms for bronze zips require bronze 1.06 kg/kg export content, polyester yarn 1.05 kg/kg, dyes 2.50% of polyester yarn weight, and sliders/end parts at actual content plus 1% wastage; applicants must ensure imported inputs are those used or required in the exported product.