The Brother DR233CL drum unit 4pk is a set of four drum units designed for use in Brother color laser printers. Each unit offers a yield of up to 18,000 pages, ensuring that you get high-quality prints without having to replace them frequently. The installation process is simple and hassle-free, making it an excellent choice for busy offices. Printer Compatibility: BROTHER HLL-3210CW,BROTHER DCP-L3551CDW,BROTHER MFC-L3710CW,BROTHER HLL-3230CDW,BROTHER MFC-L3770CDW