Are all Derma Rollers the same?

I initially started with a 0.5mm roller, and I could feel it when I was rolling, but I was comfortable. The rolling would not really cause redness on my face, only on my neck and other parts of my body. I then used a 1.5mm roller, from another company, and didn't feel any discomfort whatsoever, if anything it felt more comfortable than the 0.5mm. I hear about pain, and numbing creams, and I am confused. My face didn't even turn red. Both rollers were purchased from the UK.

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