HTS code 9902.13.30 covers "Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, such fibers containing between 28 percent to 33 percent by weight of silica, measuring 3.3 decitex, in lengths of 60 mm (provided for in subheading 5504.10.00)" 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.