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A round display base, 11 mm high. To attach to the base of Tamiya Dome Display case J, or use standalone. It would fit with 1.5mm space around it. I laminated mine with wood sheet to make it look better, and made landscape using a Modelscene terrain mat.
With 120mm diameter, it could house a few figures, a small diorama, an 1/72 or 1/144 plane or tank. My one houses several 1:150 scale dinosaurs which I printed for my daughter, who painted them and made a diorama.