HTS code 9902.14.89 covers "Silver in semimanufactured form, containing by weight 87 to 89 percent of silver, 11 to 13 percent of tin and 0.1 to 0.7 percent of copper oxide, presented in the form of strip and certified by the importer as suitable for use in electrical contact systems intended for the manufacture of switches and relays (provided for in subheading 7106.92.50) " 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.