Not so much concrete as probably plaster...
Love the look of this table, wanted something more kid friendly, yet when it arrived we got a scratch the first night on the surface during installation accidentally and the finish revealed a white substance under the coating on top of table. The scratch occurred with very little effort, I was disappointed to be sold something I thought was true concrete on top therefore more indestructible. It appears to be a solid plaster top with a gray painted finish. The set is sturdy and I love the chairs, but hoped the top would take a little more abuse now I feel I need to cover it as to not risk any more damage. Very disappointed!