They come from Hansell Composites Ltd....
http://www.fibre-lyte.co.uk/fl/fl_cycles_carbon_chainring_2011.html
They can do a selection of finishes, etching, custom designs and other bits.
The workmanship is really good, i'm very impressed
They do loads of other carbon bits for bikes and willing to take on projects or custom work. Really nice guys and a pleasure to do business with.
Wow, those prices are very reasonable. I was thinking wallet busting stuff.. but not so.