This is the replaceable derailleur hanger made by Pinarello for the Paris Carbon and F4:13 framesets. Please note that it is not compatible with other Pinarello frames besides these two. FYI, the Prince Carbon does not have a replaceable hanger, nor do any of the Dogma models. The aluminum models (Paris, Prince SL, and Prince) went through an evolution in hangers, none of which match the version Pinarello uses in their carbon fiber frames.