These Were Given To Us. I Think They Were From A Military Surplus Or Restaurant Supply. They Were In An Original Box With A Number Of Others, And Appear New, Even Though They Have A Few Marks On Bottom From Rubbing Against Another Plate. A Hard Resin Type Material. Pretty Sturdy. What You Would See In A Cafeteria Or Restaurant. They Look Tan In Picture, But It Is More Of A Muted Mustard Yellow Color.