The hardboard backing is way sturdier than the flimsy lap boards I've used before, so they don't bend when the kids press hard with chalk. Ten in the set means a whole small group can work at once, and flipping from chalk to markers takes a second.
Bought these for my classroom and the double-sided design is a lifesaver—kids can switch from chalk to markers without me handing out new boards. Ten in the set means no one's left waiting, and they wipe clean pretty easily too.