Stringerless epoxy. This particular one is almost too light, while testing a certain glassing combo. Tried these accelerator fins on it and made the rating of this board from a 4-6 range previously with AM and FT fins to maybe a 7-8 range with accelerators.

An interesting amount of drive and short whip now.

Not really into fins having to make a board, but I think this is an exception to the rule considering the construction of board.