Here is the Tyler Warren Quad Set from True Ames:
There are a couple of things worth mentioning about these beautiful fins. The rear fins have a slight amount of foil on the inside surface. This produces a smoother feel, especially during turns. These “80/20” foiled fins seem to work best when the rear fins are set closer to the stringer. The Future-based fins have a shallower base on the rear fins to accommodate the thinner part of the tail where they are placed. FCS fins don’t have this problem. These fins are a sandwiched bamboo/Hexcore construction, keeping overall weight very low. This particular set is destined to be used on 5-4 Mini-Widget currently being glassed.