Hi, As it says in the title, I have an almost new dura ace 7900 11T-25T cassette available. It has done 30 dry miles (one ride) so is unmarked, and is coming off my S-Works SL4 which was new in November 2012.
Cheapest I can find on the web is £140 new (CRC), so I'm asking for £100 posted (royal mail recorded delivery).
image added from Flickr, and price reduced. Cassette is currently on my bike but I can remove / take more photos if you are interested in buying.