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If you check out this tweet you can get a chance to win some super limited edition HD25-1 
https://twitter.com/Sennheiser_UK/status/306051480845164545

 

As far as I am aware it is these ones

 

https://www.facebook.com/photo.php?fbid=392347197503473&set=a.207908879280640.49405.199003806837814&type=1&theater

 

If so then they are v-rare - sennheiser only got 4 black and 4 white ones made