DR PEN ULTIMA M5DR PEN ULTIMA M5 Dr. Pen Ultima M5 microneedling pen is used mostly for face wrinkles, scars, stretch marks and facial lines. Dr. Pen uses sterile, individually sealed, disposable needle cartridges for optimal safety and comfort. The adjustable dial allows treatment that adapts to individual clients needs. (Notice that the maximum depth depends on your cartridge's type) Dr. Pen is more economical than derma roller, you just need to recharge the pen