I think they are C3yoyo Ghost lX
Got this in earlier today. The tug response on this thing is on point. I was a bit skeptical about if it would work fully unresponsive with a 4mm wide MR85, but after swapping it out and breaking it in, it plays just fine
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I put a lemon bearing in one and absolutely smacked the crap out of my knuckles 
I have a design or two that are intended for lemon bearings properly and I’m gonna make sure I recess the pads on those ones to limit the danger.
A special edition of the Acorn Mini with some recessed pads for lemon bearings could be fun too though some day.