These chairs are just plain awesome !!!! In a disconcerting ease the mounting !!! I have installed myself and about 6 months after nothing has changed (my husband did not even have a screw to tighten !!!). At that price it should not be without it !!!! Very stable. Small flat (if, however, is one), the slip is really slip so much that my children (4 and 6) sometimes have trouble moving their chairs themselves ...