They're 16x10. It appears pro comp, ion, and I think mickey thompson all offered a pretty close version of this. I can't tell from pics of any of them. The numbers on the back include a SAE specification, a long number that could be reference a plant in china and "16x10j et-25 69".

They came with ONE pro comp hub cover... but I'd be lying if I told you I was sure they are pro comp.

Any thoughts?

 

-25 is offset. 69 may be part of the style as ia 1069 procomp wheel.