This is a chrome plated nozzle used on the Hyper Gear, HTX, Mark III, and Optiplex. This is the "Slim" shape that is compatible with the nozzle adaptor part number M501S1 for the servo cutting heads.
Chrome Plated nozzles are harder and last longer than the copper nozzles.
Double Nozzle version available here
Also known as L1385X, 46143310381, or 46143310382.