The first year the wheels were offered in two versions.
The first version had chromed rims and polished aluminum center that was pressed in place.
The second version was pressed and welded in place and then chromed.
After a couple of years they quite eith the first version. My guess is that the cost to produce them was too high.
I use 600, 800 and 1200 grit at the end. Starts with 120.