All cartridges are tested one by one before delivery to ensure complete working condition perfect compatibility and excellent print quality. Compatible Printers: M12w, M12a, MFP M26nw, MFP M26a Printer Details of the Structure : This high yield black Toner Cartridges 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 Toner Cartridge is under strict quality control, carefully inspected and packaged to ensure that it is in the best condition. We always care about your needs, and we strive to provide you with high-quality and cost-effective products 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.