DR221CL Compatible 4 Drum Unit DR221 for use with TN221 / TN225 Toner Cartridges (Toner Cartridges are NOT Included). Page Yield: 15000 Pages per Drum @ 5% Standard Coverage Rate On A4 Paper Size. Complete Set of 4 Drums. Any Drum Can Be Used to Replace Black or Cyan or Magenta or Yellow Drum Providing Great Flexibility to Users. Manufactured By ISO 9001, ISO 14001, CE, & REACH Certified Manufacturer Important: Reset The Drums in Your Machine after installing. On your printer screen press 'Maintenance' Icon then 'All Settings'. From the list select 'Printer'. Go down in the menu and select 'Machine Life' then 'Parts Life'. Long press '#' key on the printer keyboard. Choose the drum to reset (BK.....) Machine will display 'Accepted'. for Brother Printers HL-3140CW, HL-3150CDW, HL-3170CDW, HL-9130CW & MFC-9330CDW, MFC-9340CDW & DCP-9020, DCP-9140. PRINTOXE® Brand 100% Compatible in Retail Package Shown in Image. Shelf Life exceeds 24 Months.