Is my derma roller not working on my skin if it does not cause redness at all?

I just used a derma roller for the first time. All the websites and videos I have seen of the derma roller causes redness and sometimes bleeding which aparintly is a good sign however i have used a 1mm derma roller on my skin and with good amount of preasure but my skin looks normal and i cant see any ponture holes at all close up and no redness. Does this mean the 1mm roller is not deep enough or i have bought a blunt roller maybe. I feel as if its not doing its magic if it is not causing any redness.