Maybe on the two tab style. I can and have made solid fiberglass ones. But to produce RTM versions, I have to set up new molds. Also, the difference between FCS style fins and Futures is cant. The boxes for Futures systems go in more or less flat, and the fin is canted at a specific angle, but with FCS, the fins are not set at an angle (except for some special fins) and the boxes set the degree of cant from 0-10. One of the design elements of the Chaos fins is cant. But I cannot control the cant that various manufactures have set the fcs style plugs at.