The Harmonized Tariff System (HTS) assigns a number to each product that is traded internationally to insure that customs officers and statisticians around the world are referring to the same thing when classifying a product. Almost all countries now use the harmonized tariff system. Each country can assign on its own four additional numbers, making the entire number 10 digits. The United States does this with its Schedule B system, which is used to describe exports from the U.S.
You are required to provide us with the first 6 digits of the HTS code. If any of the commodities are more than 2500 USD invalue, you will need to provide us with the 10 –digit number. The codes can be found at http://www.census.gov/foreign-trade/schedules/b/