These display boxes are made of clear plastic with two holding clear, flexible membranes. Stones, jewelry or coins appear as the are floating in the air, even though it is held firmly in place by the membranes.
The boxes is hinged with one membrane in the center of the bottom of the box. The other membrane is in the lid. Closing the Box "sandwiches" your item in place.
Box measure 3" x 3" x 1-1/4".