Heavy duty plastic. Very sturdy material. I love that they are lined.

Was supposed to be gray lining. They're a nice size so i’m keeping them, but they definitely slip around.

Shipping took too long; however, i am pleased with the item itself. Looks great for cheese, cake or any food display. I use this for presentation of my cakes and desserts so having one that is uneven in color really takes away from the look.