SELWAY Electric derma pen needles screw 12 pin cartridges for auto microneedle derma pen dermapen tips: the dermapen uses 12micro sized 33 gauge micro needles to stimulate the dermis faster than a manual dermal roller, resulting in shorter treatment times. Unlike the conventional skin treatment remedies, you do not have to spend a fortune on the derma pen. It is least expensive. The sharp needles on the derma pen will create miniscule pores on the uppermost layer of the skin. This in turn will enhance collagen production and will replace dead skin tissues with new skin cells. One of the greatest advantages of using the derma pen is that you do not have to wait for long to see visible and better results. It is easy to use the derma pen. You just need to follow the instructions on the manual that comes along with the kit of the derma pen.