Injecting the roots taken by the FUE method into the skin by means of a pen is called the Pen method (Implanter Pen Technique) or DHI (Direct Hair Implantation). This method has a more painless and faster recovery process.
The roots taken by the Fue method are placed in the pens. The doctor adjusts the depth, direction, and angle of the pens before injecting the root into the skin. After the needle is retracted, the root remains under the skin.
With pencils thinner than 1 millimeter, it is possible to transplant without cutting any hair and between the areas where the hair is less or between the beard and mustache areas without leaving any mark or divot.