Built my first ever kiteboard and the other fins on here weren't quite to my taste. This one is mathematically designed and with a round leading edge. Google the "Coander effect" if you want to see why I didn't make the leading edge sharp. :-) Dimensions:137.2 long x 8.98 thick x 40mm deep. I'm only just learning kiteboarding, lots of on line research and I've windsurfed lots but I haven't rigged up and hit the water with a kite yet. See the instructions too, it's a big ask to 3D print plastic durable enough for stresses of real life use on a board like this! Second part is a mould. Mirror image to get second half of mould!