The Lexmark C752 supplies are designed to provide exceptional value, reliability & outstanding print quality. C752 supplies offer an easy front loading design with a simple, intuitive user interface. Return/ Prebate cartridges are sold at a discounted price vs. the price of regular cartridges in exchange for the customer's agreement to use the cartridge only once & return the cartridge to Lexmark for recycling once it's empty. All toner boxes ship with prepaid postage labels for customers to return their empty cartridges for recycling.