Category: Office Supplies Review: Office supplies are essential for any business or home office. They include everything from paper to pens, but one of the most important items is ink cartridges. When it comes to printing, having high-quality ink cartridges can make all the difference in the quality and longevity of your prints. That's why I was excited to try out these Smart Ink Compatible Ink Cartridge Replacement for HP 934XL 935 935XL 934 XL (BK & C/M/Y 4 Pack Combo) for Officejet 6220 6812 6815 6820 Officejet Pro 6230 6830 6835. First, I was impressed by the variety of colors available in this pack. There are four black cartridges and one each of cyan, magenta, and yellow. This means that you can easily match your printer's color settings to get the best possible results. Additionally, these cartridges are compatible with a wide range of HP printers, including the Officejet 6220, 6812, 6815, 6820, and Pro 6230, 6830, 6835. One thing that I appreciate about these cartridges is their compatibility with both black and color printers. This means that you can use them in any printer that requires ink cartridges, regardless of whether it's a monochrome or color printer. Additionally, the four-pack combo makes it easy to keep your office supplies stocked up without having to worry about running out of ink. Another thing I like about these cartridges is their longevity. They are designed to last for up to 1,000 pages per color, which means that you can get a lot of use out of them before needing to replace them. This not only saves you money in the long run but also reduces waste and helps to protect the environment by reducing the amount of ink cartridges that end up in landfills. Overall, I am very satisfied with these Smart Ink Compatible Ink Cartridge Replacement for HP 934XL 935 935XL 934 XL (BK & C/M/Y 4 Pack Combo) for Officejet 6220 6812 6815 6820 Officejet Pro 6230 6830 6835. They are high-quality, long-lasting, and compatible with a wide range of HP printers.