This is an accessory or set of accessories for Gundam models.
Bandai brings even more goodies to the world of Gunpla with the addition of a new series of Gundam accessories called Builders Parts. This particular set is System Base #1, a great base to hold your 1/144 scale Gundam kits. The base is adjustable so it can accommodate wider kits and is molded all in one color. Check out more Builders Parts linked below.