This stmt from their "about us" gives some background (bold emphasis mine):
"Today, our now consolidated, multi-faceted organization is effectively providing exclusive U.S. parts distribution and warranty administration in support of approximately 200,000 Daewoo vehicles in all 50 States, through more than 400 authorized Daewoo parts and service locations. Pentius thereby has a substantial existing U.S. sales base supported by a number of suppliers based in Asia, as well as a direct working relationship with a leading South Korean manufacturing entity who, among other things, is a direct OEM supplier to a number of vehicle manufacturers including Hyundai and Kia."
Which to me means probably... Made in China. Although they do mention South Korea, which is usually decent quality.