Laser print cartridge is specifically designed to assure optimal print quality with crisp, dark output from first print to last. A clean-hands design means easy cartridge installation and removal. Optra T print cartridge is designed to work with Optra T printers (T610, T612, T614 and T616 Series) and will not work with other products. Cartridge yields approximately 10,000 pages at 5 percent coverage. Lexmark Return Program Cartridges are sold at a discount, versus 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.