Rating history: 21 and 21b HP cartridges and the different between the two
It is HP 21 Black Ink Cartridge and the model number is written as HP 21 B where B stands for Black ink cartridge.
It is used for low volume heavy quality laser printing jobs and has 5ml of ink. It can be refilled. It can be used for Printers with model numbers- Deskjet 3910, 3930/v, ...
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