Dr. Pen 42 Pin Needle Replacement Cartridges - 10 Pack for A6, E30, N2, M7, M5 & MyMDr pen 42 pin needle replacement Description: Key Features and Benefits: Unique Design: The needle cartridges boast an elegant design that not only looks good but also enhances the functionality of your Dr. Pen. Disposable Convenience: Each cartridge is designed for single use, ensuring optimal hygiene standards. Simply dispose of the cartridge after each session. Adjust the needle length to cater to your specific requirements, with a maximum needle