The Kershaw Lucha is a high-quality butterfly knife that's made in the USA with flippers in mind. The blade tapers so that the top has more weight to pendulum around smoothly. The Lucha features dual KVT ball-bearing pivots for extra-easy operation, a rounded bevel so it rolls effortlessly in the hand, latch is rounded so it never catches as you flip and also features a positive stop so it never contacts the blade.