GX160 standard piston-ring materials?


Am I allowed to ask what peoples opinions are regarding the standard Piston-ring materials. I suspect/guess the following:

Top ring - chrome plated steel or iron?

2nd ring - Iron?

3rd oil control rings - chrome plated steel?

But I'm guessing, any opinions welcome, I have some old rings so I will pull them apart tonight, I guess if they fracture easily they are iron.