Chris Reeve Large Sebenza 21 Knife Stonewash Plain Edge. Typical of Chris Reeve Knives, the pivot strength is more robust than other folders. The large pivot screw and pin are supported by large thrust washers. These perforated phosphor bronze washers reduce friction and double to retain the fluorinated grease for longer lubrication thereby extending the life of the knife. Chris developed the first Sebenza in 1987 and the profile has experienced minor changes over the years. After the entirely handmade version came the Original profile in 1990, the Regular in 1996 and the Classic in 2000.