These replacement cartridges are specially designed for Dr. Pen Ultima N2/M5/M7 micro needling pen, they are not compatible with other models, such as A1, A6, A7, X5, or any other brands.
Dr. Pen uses sterile, individually-sealed, disposable needle cartridges for optimal safety and comfort.
All replacement needles are made by Dr. Pen factory, come with Dr. Pen brand original box.
Dr. Pen microneedling pen is more economical and healthful than derma roller, you just need to replace cartridges after every use.