
The MR TFX comes as a super twin setup. So, two large fronts (5.06" base length) and a mini center fin (3.55" base) meant to provide a little extra stabilization. Obviously you can remove the stabilizer and run the MR-TFX's as a true twin setup.
These Mark Richards retro inspired fins offer a great balance of release and drive, with a ton of speed down the line. Especially good for throwing snappy turns on wide tail boards that could use a little bit more hold and sharpness weaving down the line.
However, I think it's worth noting that I pretty much never run them with the little trailer they come with. Instead, I usually swap in the center fin from a set of AM2s- or something similar for the extra bit of sweep.
They come in a few different colorways too:

Some key features of the MR TFX:
•Carbon Base
•Performance Core
•Resin Transfer Moulding

Overall, I'd give the MR-TFX fins a 7.5/10. They're crazy fast surf fins, but missing a little bite.
BUT with the AM2 center fin swap I mentioned earlier, I'd definitely give them a 9/10.
Get the low down from FCS:
http://www.surffcs.com/us/products/fins/thrusters/FCSMRTFX.aspx
Or buy them online, from FCS directly:
http://surffcs.mwrc.net/en/category.php?product_category_id=4204
Or try RealWaterSports in NC, good people:
http://www.realwatersports.com/fcs-mr-tfx-pg-tri-fin-set-blue