Blake Printing Supply 5 Pack Gray Compatible CLI-251XL CLI-251 CLI251XL Ink Cartridges for PIXMA iP8720, MG6320, MG7120, MG7520 Blake Printing Supply  5 Pack Gray Compatible Ink Cartridges for PIXMA iP8720 PIXMA MG6320, PIXMA MG7120, PIXMA iP8720, PIXMA MG6620, PIXMA MG7520 5 Gray Premium Blake Printing Supply brand of cartridges. CLI-251GY, CLI-251GY XL, 251, 550, 250, 251, CLI-251, CLI-251XL, PGI-250, PGI-250XL, PGI-550, PGI-550XL PIXMA iP8720 PIXMA MG6320 PIXMA MG7120 PIXMA MG7520