Customs tariff amendment adjusts classification and zero-duty treatment for specified polybutadiene rubber imports under the India-Korea CEPA. Substitutes the entry for serial number 342A to read 'Polybutadiene Rubber excluding titanium and lithium grades,' inserts a new serial number 342B for tariff heading 400220 covering all goods other than those under 342A with a nil duty rate, and amends the second proviso, clause (b) to refer to both serial numbers 342A and 342B; implemented under the Customs Act and India-Korea CEPA Bilateral Safeguard Rules, 2017.