After producing and testing many prototypes and trying different combinations of 2d design and profiles we have been able to develop unique designs for our twin and quad set up. Our Walu fins have thinner profiles then most quad fins with the help of our unusual extra roundness on our trailing edge we are able to make fast profiles with less thickness meaning less drag, a crucial factor in quad set ups. Still the fins have enough power to get you going upwind. Since many riders now ride quads in bump and jump conditions we also added a super flex tip by reducing thickness even more in the last third of the fin. Super comfortable ride and snappier turns on the waves especially noticeable on skatey twins in onshore waves. Quad and twin fins for your lake, mushy ocean conditions or the gorge like conditions, The walu fins are for you. Sold as a set.