XL 6 Compatible Ink Cartridges with Chip replaces Canon PGI-550BK Black XL, CLI-551BK XL Photo Black, CLI-551C XL Cyan, CLI-551M XL Magenta, CLI-551Y XL Yellow, CLI-551GY XL Grey (Supplies Office)
It is distressing ... The PGBK cartridge is not compatible: it does not properly clipped, so, can not be printed in black on the one hand and, secondly, that "screws up" printheads. MAKE VERY IMPORTANT