EQ was originally manufactured in New Zealand. Those are the heads that I use. Production has switched to china for some years now. Not the same quality of cast iron. As for the rest, can't say anything. If the are made in New Zealand, I'd opt for the better materials. But as anything anymore, there's always something off. The company is in New Zealand but the product might come exclusively from china. For whats its worth, I run 10.70 at 6200 with a well prepped set of the original EQ's on a 360.