(1) Black, (1) Cyan, (1) Magenta, (1) Yellow 100mL bottle of ink. A total of 4 bottles, 400mL worth of ink. This is the equivalent of 40 cartridges worth of ink.* The Silo Ink refillable dye ink bottle contains 100ml of a custom formula made especially for HP machines. Silo Ink inks are made in Germany and guarantees to have the same consistencies as ink made from HP. Our refillable bottles come with a nose tip that makes refilling your refillable cartridges or systems a quick and easy task. Each bottle of ink holds approximately 10 cartridges worth of ink. Print over 4000 pages at 2% coverage with each bottle. *based on HP564 cartridge size of 10mL per cartridge.