Each circle is ½” thick. If you have any questions feel free to contact us. Every circle is checked to the highest quality standards. Current Circle Sizes: 6” round cutouts 13” round cutouts 16” round cutouts 18” round cutouts If you need a hole added to this shape leave us a note at purchase with the desired size and location of the hole. Our goal is to help you with your project as much as we can and we're happy to do it free of charge! The face veneer has a smooth surface with a light uniform color while the back surface typically has 1-2 small color-matched patches. The thick face veneer provides a smoother surface for CNC routers or engraving machines to glide on the birch wood.