Econo or whatever.... These rotors are usually all off shore made, eg. made in China. They come under different names but probably made in the same factory. Here in Canada these rotor are available for less than 1/2 the price of brand name rotors. I've used these cheap rotors and found out the hard way. They are not balanced and they warp easy. The origin of where they are made is not casted in the metal. eg.( made in USA or Canada). I did eventually buy brand name rotors and of course they were made in Canada. No problems now.
Live and learn as the saying goes.