This kit can be used as part of a regular head maintenance or when a printhead has been left unused for prolonged periods of time. Compatible with the Canon BCi3e / BCi6 / Pixma 5 / Chipped 4 Cartridge / Chipped 5 / CLI-521 / CLI-525 Cartridge printer. Please refer to the enclosed instructions for use. Deco do not accept any responsibility for the results in using this kit. This cleaning kit is not produced or endorsed by Canon.