If you use a Dr Pen M8S microneedling pen, the cartridge is far more than a disposable attachment. It determines how many needles reach your skin, how much stimulation your tissue receives, and whether your session feels targeted or aggressive. A high-quality, genuine Dr Pen M8S cartridge keeps the needle cluster stable at your chosen depth, while a low-quality or wrong pin count can reduce results or increase irritation. This guide explains how Dr Pen M8S cartridges differ, how to select the right one for your skin concern, and how to handle them safely from first use to disposal. What Makes Dr Pen M8S Cartridges Different from Other Cartridges Dr…