Centric Parts...up until about 2020 when they were purchased...ironically by the same company who owns Raybestos (and now Cardone) that supplies rotors to NAPA lol.
Pretty much every aftermarket rotor (regardless of who's label is on it) has come out of China for the last 20 years...and before that too. There are some very good ones coming out of china...best I've seen actually. There is also crap. It has to do with who's running the company that's buying them and their level of understanding of anything.
Here's a story...not brake related but another product line from a brake company with the same bunch of dipshit engineers at the helm...
We bought a company about 10 or so years ago, maybe more, that supplied rotors and drums to autozone/oreilly/pep-boys/etc....white boxes, only difference was the label. They also supplied a decent amount of the chain house brand chassis program (ball joints, tie rod ends, etc)...which I became involved with after I discovered it was shit. Now, this place was all ISO and whatever other certs made them look good. I discovered some problems with a few ball joints, and was sent test results from when they had an independent lab run some tests per an autozoo requirement the year prior. This was a ball joint that when installed, was loaded such a manner that the ball stud was always forced INTO the cup, NEVER OUT. The ball joint in use also had about 6 degrees of articulation possible from center. Each test of 250K cycles cost us somewhere in the neighborhood of $40K, and there about 2 tests per part number per supplier...call it 3 suppliers per part. We also tested OEM parts and competitor (MOOG) to see how we stacked up. These were SAE standard tests, which the test protocol calls out for the test engineer to take the design application into consideration to design the tests/fixturing/determine the loads.
All the cycle tests were performed unloaded
They did a "push out" test where they tried to force the ball stud through the forged housing
They did a "pull out" test where they pulled the ball stud out of the housing
They did a "cam out" test to see how much articulation they could get before it broke
I forget the last one.
Anyway, they couldn't push the fucking ball stud out because it was in a solid forged housing
The pull out test was fucking stupid and a waste of $40K x however many of that part number we tested because the joint would NEVER see loads in that direction
The cam out test went to 20° or so and was also stupid because it was not possible to move it more than 6° in use.
The cycle tests were stupid because they didn't load the parts to simulate the weight of the vehicle.
The ENTIRE fucking engineering dept at this place that we'd just bought could not understand why I was losing my shit over them having wasted about a million dollars accomplishing fuck all. All they could say was "those were the tests Autozoo wanted". Nobody ever thought to maybe educate the rest of the people involved that the tests were pointless, and just did them because they're too stupid to realize it themselves.
"Engineer" in a manufacturing environment often times means the person is sort of qualified to measure a part with a set of harbor freight calipers and make sure it matches a shitty basic dimensional print. Nobody knows why the prints are toleranced the way they are or cares, or knows enough to care. A few get it, but it's rare.
These are the kind of people that run modern companies in many cases, and that's why everything is shit. Not because of China.