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Regarding the markers, they are “wipe on’ wipe off markers “, but what you need here if you're looking for a replacement (and inevitably you will) are washable chalk based markers. Accept no others!
If you've seen the Expo Washable brand, they're a pretty common brand found in many discount and drug store chains and we are told they work very well as replacements.
Hope that helps!
I'm just hanging out, really.