[DareIask?]

I forgot to say why I chose the stamp instead of the roller. I heard that after a while the rollers tend to "stick" instead of rolling smoothly. You might not even feel it when it happens, meaning the needles will drag inside the skin, and create scars, or even increase the chance of infection.

That's because they have to be replaced after so many uses. Btw, what is the stamp and how does it work?