This Brother belt unit is for use in Brother DCP-L3510CDW, DCP-L3550CDW, MFC-L3710CW, MFC-L3730CDN, MFC-L3750CDW, MFC-L3770CDW, HL-L3210CW, HL-L3230CDW and HL-L3270CDW laser printers. This pack contains 1 replacement belt unit.