HTS code 3606.10.00.00 covers "Ferrocerium and other pyrophoric alloys in all forms; articles of combustible materials as specified in note 2 to this chapter › Liquid or liquefied-gas fuels in containers of a kind used for filling or refilling cigarette or similar lighters and of a capacity not exceeding 300 cm3" 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.