Lexmark Black Ink Cartridge Dual Pack, 2 Pack of OEM# 18C1523, 2 x 215 Yield (18C1598) Lexmark (#23) X3550 X4550 Z1420 Black Ink Cartridge Dual Pack (2 Pack of OEM# 18C1523) (2 x 215 Yield) Save Time Money and the Environment with Genuine Lexmark Supplies Lexmark (#23) X3550 X4550 Z1420 Black Ink Cartridge Dual Pack (2 Pack of OEM# 18C1523) (2 x 215 Yield) OEM Ink 23 Black 430 Pages