O-I was the name given to a proposed series of Japanese super-heavy tanks, to be used in the Pacific Theater. The vehicle was planned to be very heavy and have a crew of 11. The complete history of the O-I is unknown, due to the "obscure" nature of the project and the limited documentation known to have survived post-war.

• All hatches can be built open or closed
• Suspension and road wheels movable
• Photoetched parts
• Metal barrels included
• Markings for 4 fantasy vehicles
• Workable tracks
• Figure included