Toner Tap Compatible Toner Cartridge Replacement for HP 312A ( 4-Pack ) Utilize 20% OEM materials and 80% new components to make eco-friendly Toner first-to-last full printing cycle guarantee 2,400 pages for the Black, 2,700 pages for the Color at 5% page coverage Economical solution for your printing need TT premium formula guarantee longer shelf life and generate less waste toner