I say Ching back in the 90s and early 2000 was a type of plastic. Similar to DX but different.
I know Three Putt will tell you I am completely wrong yet he won't be able to explain what it is/was.
I have Ching Aviars, Rocs and Cobras in my bag at different times. I can tell the difference in plastic the same way everyone can with the other Innova materials. By how it feels.
Back before the Internet this was never an issue, we all agreed it was a different type of cheaper plastic.