3x3x3 cube, which looks like a 3x3x3 within a 2x2x2, but the 2x2x2 edges are clearly attached to one 3x3x3 edge and there is no bandaging of the inner 3x3x3.
The heights of the sich internal ball faces are different, so it's a bump cube.
Opposite faces have the same height, so a 180° turn of a solved puzzle results in a solved state again. Nevertheless an attractive puzzle to solve without stickers.
Size: edges 5.7cm