• Original Dr.pen cartridges, compatible with models A8S, M8S, and A9 • The package contains 20 cartridges with 36 pins each, individually packaged to ensure sterility and prevent cross-contamination • The 36-pin model provides the deepest treatment, making it especially suitable for severe skin issues such as deep scars and pronounced wrinkles • It is recommended to change the needle after each use to maintain hygiene and treatment effectiveness • It is important to always have enough spare needles and to use the appropriate type according to the treatment needs • Not compatible with the Dr.pen M8 model