Help documents get an even distribution of toner with this belt unit. The 50,000 page yield makes it easy to go for longer periods of time before needing to get a replacement. This Brother belt unit is made for use with select Brother machines for simple, quick installation and high-quality results. You can count on the durability of this printer belt unit. Unmatched reliability means you get long-lasting, high quality results. OEM replacement parts equal proven quality.