Basics® Brand cartridges are manufactured at ISO 9001:2000 registered facilities using returned, original equipment cartridges. These cartridges are designed, engineered and manufactured to meet OEM performance while ensuring top quality and consistent output. The plastic shell contains an average of 90% post-consumer recycled material OEM 27X. HP LaserJet 4000, 4000N, 4000SE, 4000T, 4000TN, 4050, 4050N, 4050SE, 4050T, 4050TN. Contains a minimum of 87% post-consumer recycled material. Yields 10,000 pages. High yield. Black.