This is a set of injection-plastic accessories for detailing AFV kits.
Miniart does just that: creates works of art in miniature! And this diorama set with field gun and figures is no different, featuring a sharply vacu-formed base and ruins, with injection-molded 57mm ZiS-2 76.2mm or ZiS-3 gun (you can build it as one or the other) and five-member crew. Includes everything shown on the box art (but of course, it's unassembled and unpainted!).