I am trying out this product to see if it does what they say it will do - help awaken sleeping follicles. With it I use Beard Growth Serum. My needles are .05 mm. I am now aware that these rollers are available in 1 and 1.5 mm sizes which I will get later.
Easy to use and you’re getting your money’s worth. Will definitely purchase again when it’s time to replace the roller.