This is a posable action figure from the Nendoroid series.
Adapted from the Good Smile Company website:
A new Iron Man Nendoroid has appeared -- this time, it's the Mark 85 from "Avengers: Endgame!" It features full articulation and metallic paintwork and partition lines of the figure match the real suit suit, ensuring he looks great no matter how you pose him. Both masked and unmasked head parts are included. Using the included Repulsor effect parts, you can easily recreate action scenes from the film.
Be sure to add him to your collection!