Customs tariff amendments: new import classifications added and cardiac catheter description revised, changing duty treatment for specified goods. The notification amends the customs exemption schedule by inserting three new tariff classifications-Carbon Black Feed Stock; Polyester Chips; Coronary stents and coronary stent systems for use with cardiac catheters-and by substituting in the Annexure List 37 item (2) the description 'Cardiac catheters with guidewires,' thereby updating the classification and descriptive scope within Notification No. 21/2002-Customs.