Longboard fins

The most common fin system for longboards and singlefins is the US-Box. The fin is attached with a screw that is attached to a nut that is located in a rail in the fin cassette. With this system you can adjust the position of the fin. NOTE! Note that the FCS II also fits US Boxes. For longboards with a 2+1 system, you can add 2 side bite fins for extra stability to your single fin and a little extra speed.