I purchased these markers for the Plumbers at or shop . I was asked to get them from one of the plumbers in the field. He said they work great on marking walls and floors .
Tru Red so far has been a very good marker. The ink flow is very consistent and dark. You do not have to go over the area you are marking to darken it up. I would recommend this marker.
Our office loves these black markers. They are actually better than Sharpies if you can believe it! I will always buy these instead. Bous that they are less expensive than Sharpies as well!