Package includes: 1 x CE320A Black, 1 x CE321A Cyan, 1 x CE322A Yellow, 1 x CE323A Magenta.Page yield:Up to 2,400 pages per black toner cartridge and 1,800 pages per color toner cartridge at 5% coverage.*Tips: Please confirm your printer model#.Printer Compatibility : HP Color Laserjet CP1525n Printer.HP Color Laserjet CP1525nw Printer.HP Color Laserjet CM1415fn Printer.HP Color Laserjet CM1415fnw Printer.Installation Instruction: 1. Before use, shake the new toner cartridge horizontally for several times to make sure the toner powder is well distributed. 2. Pull out the black paper cover out of the toner cartridge's body in the direction of the arrow shown. 3. Pull out the sealing tape at a slow and constant speed as to prevent the tape from breaking midway. 4. Carefully install the new toner cartridge into your printer and you are all set to print. How to contact us: Log in your amazon buyer account > Click Your Account > Your Orders > Find your order and click CONTACT SELLER, then we will give you a response as soon as possible.