ComMarker20 Pcs Brass Blank Challenge Coin,2.2mm Thickness Threaded Edged 40 mm Engraving Blanks Coins,Acrylic Protection Box for DIY Crafts Engraving Travel Commemorative Collection Supplies

I have the F1 Ultra from xtool. Took a few times to get the setting dialed in and engraved nicely on both sides. I didnt use a depth map rather a png from adobe illustrator with 3 different grey scale. I could have blurred a bit but I like the sharp edges from my lettering. the emboss was text and objects the grey scale was the depth and settings was 300dpi, 3000 speed, with 120 layers at 100 power and freq 30.

These were my 3rd attempt at finding a good quality brass coin for engraving with LaserPecker 5 engraver. They all came in individual capsules and in great shape. I felt the finish was perfect for engraving, yet easy to polish afterwards. Coin are heavy and feel very high quality compared to the 2mm and 2.5mm ones I purchased prior. I did find that depending on the type of engraving (embossed/3D vs. 2D photo, using a black matte marker first, then wiping off afterwards, resulted in a much bolder/deep engraving. Setting are still tricky with the LP5, however, these coins were exactly what I needed.

These engrave fine, but not phenomenal

I got a bad batch, if the seller makes it right I will update review, this is fixable and 5 stars are possible.I got full 3mm coins, and the surface finish was almost as good as the 2mm coins on Amazon. However when I opened the first plastic case up, I noticed brass burrs around the coin edge, and brass flakes were all over my fingers. The edge of the coin looks like it was cut by hand with a dull hack saw. The grooves are uneven in every way, that are uneven in depth, in visual height, and in surface level. These copings look really really bad out of the plastic case, the edge is awful and it should have been chamfered and deburred to improve the edge. Chamfering will only go so far, however, the fact is these have a very bad edge that is unsuitable for giftst or if you sell your work these are unsellable quality. If these were solid brass, they might be good test blanks for discards, except that these cost MORE than the good coins, and they are not solid brass according to some of the other reviews, so as I write this I am running an excessively deep version of a coin I designed, to see what it looks like deeper down. I will update this review with my findings. half way in, still brass...I'm running cleaning passes every other pass to keep track of the brass color.... but I have to pause and take my brass colored laser goggles off ;)... Ok, after 1.2mm deep it is still brass. My image has two more depth layers (it had 5) so it may burn past the middle before the model is done, but it is looking all brass to me. But based on the fit and finish of the edge, we are not all getting the same coins, because I haven't seen anyone else with the same complaint as myself. It seems to be brass, but not the quality one needs for challenge coins. The edge is the only part that comes finished, and if it is bad, the whole coin is bad.

Coins work just fine on my fiber. F1 ultra.Was able to do this coin without problem.It needs a little clean up, but engraved just fine.

Out of every 3 units the plastic cases are cracked.

The media could not be loaded. If these were actually brass blanks, a magnet would not attract them.I just got around to engraving one today. Used the settings I used with the small coin that is actually brass. Put it in the tumbler. It won't clean.Tried to figure out why, it is because they are probably a thin layer of brass over an iron slug. See the video for proof where the magnet picks up the blank but not the thinner real brass blank.

Admittedly, I'm still very new to lasering, but the quality of the scoring and engraving where quite poor through the print. It was OK at first, but changed after a few layers and I couldn't get it cleaned up and looking nice after. It doesn't behave like other brass metal objects I have with the same settings. Did many test grid passes and the coloring doesn't match up at all.