All cartridges are tested one by one before delivery to ensure complete working condition perfect compatibility and excellent print quality. Compatible Printers: HL-3140CW HL-3150CDN HL-3170CDW HL-3180CDW MFC-9130CW MFC-9140CDN MFC-9330CDW MFC-9340CDW DCP-9015CDW DCP-9020CDN Details of the Structure : This high yield black Drum Units the quality of prints clearly smoothly crisp dark sharp, keep real without fading, stably and long lasting. High-blackness toner makes the picture delicate firm fixing, distinct layers and image high precision. Package: Shockproof packaging to avoid shipping damage. Every Drum Unit is under strict quality control, carefully inspected and packaged to ensure that it is in the best condition. Warm Tips : Avoid environments where temperature and humidity change rapidly, such as next to air conditioners or heaters. Store in a normal temperature and humidity environment. We always care about your needs, and we strive to provide you with high-quality and cost-effective products