Contrary to what it says, it's not flip flop but fixed/fixed. Lockrings both sides, real track nuts. $25 shipped. Win.

They look identical to these hubs: http://www.speedgoat.com/product.asp...t=260&brand=70

Completely unrelated note: what happens when faulty software causes fatalities
http://sunnyday.mit.edu/papers/therac.pdf