This is the RB-79 Ball, also known as the "round coffin" 🤓. The pronunciation is "Ball," not "Strike" 👍.
This mobile suit was created to be produced in large numbers for the decisive battle against the Principality of Zeon, and 1200 units participated in the battles of Solomon and A Baoa Qu 🤓.
It basically works alongside the GM 👍.
It's not flashy, but it's an indispensable mobile suit when talking about the One Year War 🤓.

The round thing that supported the One Year War | ゆめわか's Gunpla works