Full custom from Ben Chacon of Toxic Blades. He's known for designing the Ferrum Forge Kylin, and for making quality small custom knives. His fit and finish is perfect. The Toxicator at just over a 3.5" blade is the largest model he's made. This one has a one off grind where the edge is overbuilt and the blade flat was maximized. It looks, feels, and flips like a cross between a Pohan Leu and an RJ Martin.