Longboard Fins are extremely interesting, because all of the Fin Companies - FCS, Futures, Rainbow Fin Co., 3D Fins, Turbo Tunnel, etc - are in a situation where they all make their Longboard Fins Bhane Box compatible. If you have a Longboard, you can buy a Longboard Fin from the company of your choice. This is very cool, it opens up a ton of options, but with options come choice.