This is a very nice derma microneedle pen. It has an outer plastic shell construction but appears to be sturdy and well made. It is easy to use and works great for microneedling treatment. It works so much better than the derma rollers that I have been using. Instead of using rollers with different pin length, you have a single unit with adjustable pin length. It also fits better the highly curved contour around the nose, etc.

The derma pen uses a bayonet mount for the replaceable microneedle cartridge. It has a metal stepless adjustment knob just below the mount to set the pin length. It has 5 speed levels with a color-coded light indicator. The cordless design and the oval profile of the pen make it easy to hold and navigate.

The derma pen comes packaged in a plastic storage case inside the sealed retail box. It comes with 5 individually sealed 12-pin microneedle cartridges, charging cable and AC adapter, and user manual.

I'm really pleased with this derma pen. It works great for me and allows me to control the microneedling more precisely. It comes with 5 replacement cartridges to get started. Additional cartridges are currently available for around $2 per cartridge and there are other designs as well. Overall, this is a great derma pen starter kit. It is worth giving it a try. Good product.