The 4Pk LXTEK 902XL Black ink cartridges are compatible with HP OfficeJet 6978, 6979, and 6950 printers. Produced by True Color Toner, these high-yield ink cartridges use inkjet print technology for crisp and professional black prints. Made in Korea, South, these cartridges are designed to provide reliable and consistent performance with each use. The pack includes 4 cartridges, ensuring you have an ample supply for all your printing needs.