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 I got this Dr. Pen M8 micro-needling pen. It's their newest model so the difference between this pen and the Dr. pen A6 is that the M8 is definitely longer and it has a sleeker handle, it’s really easy to hold now the A6 the numbers where you can adjust the millimeters 0.25 goes up to 2.5 millimeters you can really see these numbers very easily but this M8 is hard to see/read. I wish that companies like this would realize that some eyes like mine can't see this, so that's kind of a drawback with this pen is that in order to see the millimeter I have to have my glasses on and it's still very hard to see while A6 you can easily read. The display on M8 is better and brighter than A6. You can very easily read the display. The cartridges of M8 are definitely thinner compared to A6, please keep in mind they are not cross-compatible with each other. There are not as many cartridge styles of the M8 so they have 16 pins and 32 pins and I really didn't see any other variation where the A6 has a ton of different pins.

The glide with these thinner needles is very easy and painless. love the design where it really is able to be held almost like a pencil and I felt like I had a lot more control in holding the pen in my application the glide of the thinner needles I thought was superior.

If you're just looking for like a basic pen keep it at a cosmetic needling or even go up to up to a one millimeter and you have thin skin and you've been hesitant to do it I think that m8 is a great choice.