Lexmark 4227 PLUS 600 CPS 18-pin print head that alternates between two 9-pin sets, extending the life of the print head. Versatile print head adjusts automatically between different paper thicknesses, saving you the trouble of manual adjustments.Standard 60KB Receive Buffer Memory. Optional Tractor 2 Feeder allows loading of two separate forms simultaneously Up to 8-part form capability. ** LIMITED AVAILABILITY !!