PGI-550 XL PGBk & CLI-551 XL. PGI-550 XL PGBk (Black). PGI-550 XL PGBk (Black), CLI-551 XL Bk (Black), CLI-551 XL C (Cyan), CLI-551 XL M (Magenta) & CLI-551 XL Y (Yellow) for use with Canon PIXMA iP7250/iP8750, iX6850, MG5450/MG5550/MG5650/MG6350/MG6450/MG6650/MG7150/MG7550 & MX720/MX925 Machines.