When I read the above comment I couldn't figure out what material they were using other than wood or plastic. I don't think using glass is common, at least I've never seen it in the US.
I was given one by a landlord once because a lot of renters here don't have the money to buy cutting boards so they will just cut directly on the kitchen counters.
I was given one by a landlord once because a lot of renters here don't have the money to buy cutting boards so they will just cut directly on the kitchen counters.