These came on my Cannondale Super Six Ultimate, and have only been used in a few races and so are in mint condition.
I would say they have covered less that 600 miles.
These are a very special set of wheels which come from the custom arm of Zipp, called Zedtech.
The hubs are dimpled for aerodynamics are fitted with ceramic bearings, which are so smooth they have to be felt to be believed. Oh, and riduculously light! They are 1233g for the pair including skewers!
The slight yellowing of the brake surface is due to the use of the top notch Swisstop Yellow King Pads which are yellow as the name suggests!
They are in superb condition, and come supplied with:
Zipp Quick Releases
Shimano Free Hub Body