They were the exact same wheels with the same rims, spokes, etc. but now they're all sold out. I bought a set before they were so cheap (d'oh!). They're machine built at Velocity (I think) but they're very well built. I've put hundreds of miles on the set I have and they're as true as the day I pulled them out of the box. I think Velocity Dyads are now the cheapest wheels available though you can slightly "off" ZAC-19s and Sun CR-18s at icyclesusa.com. I hear you can get tires on those rims with a little effort but getting 'em off is a big problem. I may try a cheap set of ZAC-19s anyway.