MCWlaser 20mm CO2 Laser Mirror Mo Molybdenum 3PCS Laser Mirror kit CO2 Laser Lens for CO2 Laser Engraving Cutting Engraver/Cutter 40W to 200W

All I can say is these worked worse than my stock mirrors. No idea why. Took much more power to do the same thing my stock ones did. I've had other Mo mirrors on my other k40 that have had no issues, but these just didn't seem to work right for some reason. Got a set of Si mirrors for this machine and started to work like I expected. I then tried them in my other machine just to check and they did they same thing. Not really sure how a mirror could be defective like this, but just wouldn't work in either. But maybe, some how I just got a crap set this round.

Works great in 40 watt/ k40 laser.One came really dirty but it cleaned up easily (1 star off for dirty mirror).Nice packaging and protection. Came in a case with each wrapped separately.I would get these again if they ever wear out.

It works better than the stock K40 mirrors, only replaced one on the head, the power had increase at least 5%.Good pice and quality mirror look thick and distortion free.

Working great so far. I was skeptical because of the price, but appear to be working as they should. I cant comment on long term durability though sinceI have not had them installed that long.

These mirrors were better than they said.Will buy again.

I just received, installed and aligned the 20mm mirrors for my K40. I have not tried them yet, but the packaging is exactly what I expected, they fit perfectly and the mirrors are flawless.

Here the next day and it was just what was needed.

Seems to work just fine. 10 times better than the stock K40 glass mirrors.

Great product. Delivered sooner than expected