It is a Customs requirement that the tariff number(s) of the good(s) imported be provided to Customs.  The 2017 Tariff Schedules for U.S. Customs & Border Protection (CBP) and Canada Border Services Agency (CBSA) are available.  Please ensure that the tariff number(s) you provide on the customs invoice is accurate and complete.  The updated U.S. Tariff Schedule is available at:  https://hts.usitc.gov/current  The Canada Customs tariff schedule is available at:  http://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/2017/menu-eng.html