This was custom-made for displaying jewelry at exhibitions. The hinges are made of brass. * Acrylic panels are used. * The base plate is removable. * They are sold for 3000 yen each, but bulk purchases are also possible. Please inquire. 4 in stock. Internal dimensions: 32.8cm x 40.2cm, height 5cm * Although hardly used, there is some discoloration, stains, and scratches due to aging.