Review on 2 Pack of Toner Bank Compatible Toner Cartridge Replacement for Brother TN227 TN227BK TN223BK TN-227BK TN-223BK Printers - MFC-L3770CDW MFC-L3710CW MFC-L3750CDW HL-L3210CW HL-L3290CDW HL-L3230CDW (Black) by Jeremy Monroe

The cartridge on the left is my original cartridge and needs to be replaced. The cartridge on the right MUST BE COMPATIBLE WITH THIS SIZE. UPDATE: The cartridge works, but it's a "LEGO" project. You have to press the green button (my husband said blue but I think it's green) to take out the old cartridge and THEN you can put the new cartridge in. It should be accompanied by better instructions than I just gave, or ANY instructions. general. I would give it 5 stars if it had instructions.