The BrotherĀ® DR-110CL Drum Unit, Black/Color (17,000 Yield) is a vital piece to keep your Brother printer/scanner running smoothly and printing crisp, clean, accurate lines and images. This unit is convenient for its combination of black and color cartridges and all can be replaced easily with one single piece. The drum is the method by which toner-essentially, the ink-is delivered to the paper or printing surface. This delivery method is the final piece which determines how the toner is applied, and thus it determines the accuracy of printing. A deteriorated drum can lead to leakage, especially along the edges of sharp lines or curves, leading to blurring or soft-edged images and lines. This might not sound like the end of the world, but if words are printed in size 12 point font or below, any blurring of the edges of letters can lead to dramatic illegibility. The last thing you want to happen, after you’ve spent countless hours and billed hundreds or thousands of dollars to a client, is for your final delivery of the product to be blurry or lackluster in any way. Think of this drum unit as the final delivery method that brings your ideas from concept to reality, that translates your thoughts from your head to the real world. Will the Brother DR-110CL Drum Unit, Black/Color Work With Your Printer? This drum unit will work with Brother printer and scanner model numbers as follows: DCP-9040CN, DCP-9045CDN, HL-4040CDN, HL-4040CN, HL-4070CDW, MFC-9440CN, MFC-9450CDN, MFC-9840CDW. Toner cartridges must be purchased separately. Does This Include a Brother Laser Printer? No, this is for the Brother DR-110CL Drum Unit, Black/Color and does not include a printer. The printer must be purchased separately; check Sam’s Club for Brother printer prices. Will This Drum Work with a Brother Wireless Printer? Yes, this drum will work with the above-mentioned printer models. Wireless printers and scanners are a technological breakthrough that makes office administration easy and seamless, without constant battling over the printer cord or constant back-and-forth from the printer unit. This drum is the final piece in the puzzle of complete office harmony.