Microneedling with the Dr.Pen A6 Ultima The A6 Ultima is a high powered device with up to 16000 RPM, great for home use or professional use. With the additional battery for back up the A6 is super easy to use. When microneedling the A6 creates tiny micro-injuries on the skin, that the body then repairs with additional collagen production(collagen induction therapy), promoting increased cell regrowth, skin regeneration, and hair growth. When paired with facial serum, it can provide even better results, as the serum helps to boost the absorption of microcurrent energy.