“Over the past 10 years we’ve developed a new procedure called follicular unit transplantation, where hair is transplanted exactly the way it grows,” said Dr. Robert Bernstein [...] This new technique replaces the plugs — groups of hairs inserted into round holes in the scalp — used in the early days of hair transplant procedures. It is now known that hair grows in groups of one to four hairs.

Q: How are recipient sites made? A: At Bernstein Medical – Center for Hair Restoration we use a series of custom made, ultra-fine blades to create recipient sites. The blades differ in size by only one tenth of a millimeter and range from 0.6mm for one-hair follicular units to 1.2mm for 4-hair follicular units. At [...]

Excerpt from the interview:

Charles Gibson: Are there good candidates and bad candidates for this?
Dr. Bernstein: Yes. And actually people that wear hairpieces are sometimes tricky because their baseline is a full head of hair, so one of the important things that we had to discuss in the first consult was what his expectations were and whether he realized that a transplant wouldn’t give him the fullness of a hairpiece, but of course, it would look much more natural.