The 2PK Premium CF287A 87A Toner Cartridge by Aztech is compatible with HP Laserjet Pro M506, MFP M527, and M501dn printers. This black toner cartridge has a new chip and is designed to provide high-quality printing with a page output of up to 9,000 pages. It is compatible with various HP models, making it a reliable choice for professional printing needs. The toner cartridges are specifically designed for laser print technology to ensure crisp and clear black prints for your documents and images.