As per US import data provided by Zauba.com, the top imported bulk commodities from Bulgaria to the USA are under the following Harmonized System (HS) sub chapters: HS 7213 (Bars and rods, hot-rolled, in irregularly wound coils, of iron or non-alloy steel), HS 7216 (Angles, shapes and sections of iron or non-alloy steel), and HS 7222 (Stainless steel wire).