The HP 201A LaserJet Toner Cartridges are a pack of four cartridges in black, cyan, magenta, and yellow colors, specifically designed for HP printers. They are compatible with HP LaserJet Pro and HP LaserJet M252/MFP M277 models. These cartridges are intended for laser printing technology and are ideal for producing high-quality prints with vibrant colors. Perfect for users looking to replace all colors at once, this set ensures consistent and reliable performance for your printing needs.