Automatic knives generally open by pushing a button or pushing a lever. When doing either the blade automatically flips out from the closed position. These Automatic knives range from as small as a 2" blade up to a massive 9" blade. usually comes in stainless steel or damascus steel.These knife handle come in a multitude of solid colors, perl type colors, stag handles and more. The 2 types of automatic knives are the side opening and the out the front opening.Some of the most popular are called the GODFATHER knives.