This device has 540 titanium microneedles that measure 0.5 mm. Suitable for use on
the skin, beard, and hair. 
 
Derma rollers may stimulate hair growth.
 
These products have microneedles that prick the skin and may help hair growth by increasing blood flow to the scalp. Recommends sterilizing the device in an alcohol solution before and after using the derma roller.