So this set is a 5.3" + 3.35" sized twin plus one you could stick under any twin plus trailer-ready bottom, but it'll also surely liven and loosen up any regular tri-finned board you're surfing now. Two sturdy upright twins with a nifty little trailer fin will speed up you're board and make it easier to turn because of the smaller center fin and smaller rake of the side fins without losing any stability whatsoever. Enjoy!
Oh and here's the full lingo by Macho:
Colours and finishes may vary slightly to the photos.
Our twin fins come with fin sleeve.