Customs exemption for specific tariff goods caps assessable duty on imports to a prescribed ad valorem rate. The Central Government, under section 25(1) of the Customs Act, 1962, exempts all goods falling under sub heading No. 8201.50 when imported into India from so much of the duty specified in the First Schedule to the Customs Tariff Act, 1975 as is in excess of the amount calculated at the rate of 60% ad valorem, superseding the earlier notification.