This is an original, OEM Brother WT4CL laser toner collection unit for your Brother laser printer. The Brother WT4CL laser toner collection unit helps keep your printer running smoothly. When your printer prompts you that the unit is full, simply pull it out and replace as needed. OEM (Original Equipment Manufacturer) Brother WT4CL laser toner collection units are built by Brother! Ideal for both home and office use with the Brother WT4CL cartridge toner collection unit.