Do you know about Chalk Ink Markers?

I have been making a bunch of chalkboards for my booth. I am bothered though by how traditional chalk looks a bit dull and dusty. I bought some of these Chalk Ink Markers and love them. I am guessing this is what they use in some of the chain restaurants like Chili's for their chalkboards. I want every color they make now. Check out the video from above to see what I am talking about.