The Tesso Tonor Extra High Capacity Toner Cartridge 4-Pack in black, cyan, magenta, and yellow is designed for use with the Workcenter 6515 and Phaser 6510 printers. This toner cartridge set is compatible with the 6510 model and provides an efficient solution for high-volume printing needs. The Extra High Capacity cartridges ensure long-lasting performance and high-quality prints, making them ideal for professional and home office environments.