Derma-rolling in old tummy stretch marks

[icanbreathagain]

So I saw a video on FB, Yerh I know, about Derma-rolling and after a few searches on google it seems it could be the answer to by saggy and scarred tummy. I want to make sure I'm doing it correctly tho. Has anyone done this successfully? Is so what do net it recommend.

You might concider a derma needling pen rather than the rollers as the puncture wounds are straight in and out. With the rollers the puncture wounds are larger as you can see from this diagram.