To those of you who have a co2 laser engraver . Use caution as to engraving clay brick pavers ( bricks ) your tube may burn out a lot faster or even catch fire.
I done a brick and it didn't look nothing like i seen on web sites so i called the manufacture and that is what they told me. There are certain laser engravers ( he told mE the names ) i do not remember there names off hand. Just thought i would pass this along