A remanufactured toner cartridge was recycled while maintaining the original seals and core. It uses parts from another toner cartridge that was returned (usually because there was no toner left). The internal parts are typically replaced with new OEM (original equipment manufacturer) parts to maintain its quality and come with a standard manufacturer warranty. This is the reason you can return them to office equipment stores like Staples and Office Depot, who will then sell them back to the manufacturer for recycling. They are often more expensive because the process that is used to seal the seams correctly takes millions of dollars in equipment and labor costs.