The flange is zinc plated steel and the pulley is aluminum. They cannot anodize it without masking off the flange which is very tedious work (all the teeth).
Long story short…the adapter side is anodized but the pulley side isn’t. Looks weird from the beginning until you realize you can’t see any difference
Yep fits excellent. I think the holes on the tb110 core are a little bigger than typical kegel, by a very small margin. They are easy to press in by hand, but have no slop.