The photograph shows a set of 2x2x2 fused cubes. From right to left, you have a pocket cube by itself, 2 fused pocket cubes, 3 fused pocket cubes and 4 fused pocket cubes. They came as a set.
Joining 2 cubes together by the corners means that you can solve them one-at-a-time. These are therefore trivial variations on the pocket cube - no harder to solve and, like a lot of the mini pocket cubes, not the most stunning quality.
These things look far more interesting than they are to solve - strictly for collectors I'd say.