Kershaw created a high quality butterfly knife that’s made in the USA. The materials include a 14C28N stainless steel blade and an all steel handle. The Lucha Butterfly design has the blade tapering so the top has more weight to pendulum around smoothly. The 5150 features a dual KVT ball-bearing pivot for extra easy operation. The handle was created with a rounded bevel so the knife moves through you hand effortlessly. The latch features a rounded appearance as well so it will not latch when you are flipping and has a positive stop so it will never ruin the blade.