HTS code 9902.15.06 covers "Riser joints of iron or steel, designed to connect drilling rigs to subsea riser containment packages, the foregoing certified by the importer as designed for high bending moments and tension at the bottom and top of riser (provided for in subheading 7326.90.86)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.