Despite the advertisement and tags of being Brother cartridges these are not. They are ProColor branded, compatible with Brother models that use the LC31 series. The actual model numbers are PB-31, not the advertised LC31's. Do not order these if you are expecting Brother branded cartridges.PB-31/800CPB-31/800MPB-31/800YPB-31/800BThe seller sure had them shipped fast though. Expected by the 30th, got them on the 27th.