Scubapro Jet Fin are considered the best tecnical fins from advanced diver since 1965. Featuring a proven vented design that decreases drag on the up stroke and enhances thrust on the down stroke. Divers who use the DIR Hogarthian system will benefit from the use of Jet FIn fins when doing frogkick, backward, and Helicopter finning. They have been revised few times over the years. With last revision Scubapro insert a hole in the blade to easily attach fins to the bcd