I was not quite sure what is meant as "Rebuild" for this toner. Now I know: Used, non-original cartridge that was refilled. The cartridge was outside pretty full with the toner, so I've got black hands. The first pages of this toner were pretty smeared. After 5 pages acceptable. Let's see if this is the case with the 5000 pages. Next time I order a refill and rather use my original Brother cartridge.