Yield: 2,000 Copies (recommended for the PC400 series copiers) * Cartridge yield is approximate, based on a 5% density document.ì Heavier or lighter densities may reduce or increase actual ì yield. Copy exposure and other factors will also affect the ì yield. (The E40 and E20 cartridges are interchangeable Note:-Toners, Drum, Copiers, and Printers CANNOT be returned if opened and used.