Lexmark #24 Color Return Program Print factory (OEM) Cartridge 18C1524 For use with: Lexmark X3500 Series, X4500 Series, Z1400 Use Lexmark Genuine ink and paper for best results! A variable amount of ink remains when this cartridge must be replaced. This is a non-refillable cartridge licensed for single use only. Return empty cartridge only to Lexmark for remanufacturing, refilling or recycling. Replacement cartridges (24A) sold without those terms are available.