Ink cartridge is designed for use with the Lexmark X4850, X4875, X4950, X4975, X4975VE, X6570, X6575, X7550, X7675, X9575 and Z1520. The evercolor2 ink, a unique formulation of pigment-based color ink, combines exceptional resilience with improved archivability. This ink is water-resistant, fade-resistant, humidity-resistant and highlighter-resistant. Lexmark Return Program Cartridges are sold at a discount vs. the prices of regular cartridges in exchange for the customer's agreement to use the cartridge only once and return it only to Lexmark for remanufacturing or recycling. Cartridge yields approximately 220 pages.