Premium 0336C001AA (CLI-271XL) Black Ink Cartridge fully compatible with the Canon PIXMA MG5720, MG5721, MG5722, MG7720, MG6820, MG6821. The use of compatible supplies does not void your printer warranty. (0336C001AA, CLI-271XL, CLI271XL, 0336C001, CLI-271XLBK)