Howsir HP pro L7580 printer partner,uses the special ink of the printer HP pro L7580，with 4 separate color. Black ink is pigment ink,which printing black pure, does not have the fragments, does not bleeding the paper, flowing is good, does not agonic color, does not caulking, the performance-to-price is best. HP pro L7580 CISS of the printing effect may compare with the original ink. It is equal in above original ink 10 times, reduces the printing cost greatly. HP pro L7580 CISS can save 90% printing cost for you. Does not need to adapt the printer, uses up a color to add a color. HP pro L7580 CISS of the printing color can compare with the original cartridge of HP 18，with the auto reset chip,never change the cartridge.The long time printing is more stabler, does not need to maintain, you can print what you desire.