HTS code 9902.14.70 covers "Catalytic converter needled blanket mats of ceramic fibers, containing over 65 percent by weight of aluminum oxide and not over 3 percent of acrylic latex organic binder, of a basis weight greater than or equal to 1745 g/m2, measuring 10.0 mm or more in thickness; the foregoing presented in bulk, sheets or rolls, designed for use in motor vehicles of heading 8703 (provided for in subheading 6806.10.00). " 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.