Pena Knives. Enrique Pena, an American knifemaker from Texas. He specializes in the making of folding knives, but his offer also includes knives with a fixed blade and tools. The one of most popular designs are folding knives with front flipper quick opening. Pena Knives offers knives to a wide range of users also due to the production versions of their knives known as Pena X-Series.