If you believe their specifications, the Dr. Pen dermapens appear to range from 8000 - 18000 rpm. For what it's worth, the first session I did with ~0.8mm dermapen caused my scalp to be red for a day longer than hard 1.5mm deramrolling. I did not bleed with the dermapen (I did a lot with dermaroller) but it appears it really did 'wound' more if I gauge that with the redness. I also appear to be peeling like a sunburn three days post needling.but how do you know it's actually 8000rpm, that would require the motor to make 150 stabs per second. I don't think there are any dermapen motors that fast.