Lexmark No.42A Black Cartridge for use in Lexmark X4850, X6570, X4875, X6575 and X9575 printers. OEM Ref - 018Y0342E. If you are looking for an inkjet cartridge that will never let you down, look no further than this Lexmark cartridge. Designed especially to get the best out of your Lexmark printer, you can be sure of this cartridge's results. This ink is designed to bring you sharp lines and clear printing that is perfect for sharp, easily legible text. If you want rich tones and subtler blends of shade, then this ink is designed to provide you with that range.