It originally stuck in my Canon pixma mx922 to replace pgbk 250 pgi-250 but my printer said there was nothing there. I restarted my printer and it said there was something in the slot but it didn't print. It's essentially a placeholder to override the use of pgbk. Really lame and expensive is not possible. I even tried a deep clean, head alignment check and many injector samples (pgbk test) and nothing helped.