They are the absurdly expensive Arundel Mandible cages. I only own them because I work at a shop, which makes them reasonably affordable. Having used them, though, I would pay full retail if I had to. They are the absolute best cages I've ever used. I got the oil slick gloss (UD carbon) finish to match the campy cranks. They make a still very attractive, and much more affordable, polished stainless steel version that looks better than any other cage imaginable on a nice classic steel bike. I also own some sideloader cages they make that were on my MTB for use of a frame bag. I really can't think of a better bottle cage manufacturer.

EDIT: And in case you're wondering if I'm that insufferable guy that tries to sell the most expensive things possible, I sell about 100 plastic Bontrager cages for every Arundel I've seen go out the door. I think they suck (does NOT hold bottles very tight), but most people think 20 bucks per cage is a reasonable amount and I'd be hard pressed to argue that point.