edit- oh, nevermind, someone knew the answer before i posted this.

I believe those are sort of a hybrid between cartridge bearings and cup and cone. I'm not sure but you may not be able to get the bearings out as there is some sort of race in there. Rather you would have to pull out the whole "cartridge".

I don't know much about them but I know some of those supurbe pro hubs had a unique bearing setup, and I think that's one of them. If you don't have luck here ask in the fixie forum.