These refill packs require the chip from the original HP toner cartridge to be reused. It's easy to do. And worth the money. These refills are a fraction of the price of HP refills and work very well and last a long time. Just be sure to keep the chip from the cartridge that came with the original HP toner that your printer came with. Even though these refills don't come with a chip, the savings are worth the extra step of replacing toner cartridges. I bought them twice and I really like them.
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