HTS code 9902.13.03 covers "Acrylic filament tow (polyacrylonitrile tow) containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, dyed, presented in the form of bundles of crimped product each containing 214,000 filaments (plus or minus 10 percent) with an average decitex of 3.3 (plus or minus 10 percent) and length greater than 2 meters (provided for in subheading 5501.30.00) " 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.