From the anime series Gundam Build Divers Re: RISE, a new HGBD:R armor support custom option parts equipment model kit has arrived!

These parts can be used to combine with any HGBD:R kit containing a Core Gundam —from Earthree Gundam, Venustwo, or Marsfour for new configurations. It can also combine with other future HG High Grade equipment and its Mercuone Weapons set! Perfect for Aquatic and Underwater Gunpla Battles!