All of the EcoInk products are remanufactured with only original empty cartridges under the following international quality standards and certifications. They are produced in ISO 9001 / 14001 certified manufacturing facilities under stringent quality control guidelines to ensure the highest level of quality and reliability. Our cartridges are STMC certified and go through a rigorous testing process standard to ensure you receive the absolute best printing results. They have been tested and monitored for performance quality and page yield.