Thanks guys. I started with the one that looks like the top one in the image above. According to the instructions the 4000 and 6000 should be satin finish, with 8000 and 120000 high gloss. Not sure how I've ended up with a reflective finish with just what I think is 4000 then.

I know the purple one I have is definitely 6000, because it's got '6000' stamped on the back in ink. Why they can't do that with all of them I don't know. :-)