These are modular robot parts that I made for a randomizer I programmed in Unity. They are all designed in a way that every limb and head fits to the torso and can be randomly swapped out. The arms and the legs (except for the wheel leg) are individual objects, hence can be swapped out individually. Every part belongs to a 'set'. I came up with complete robots, and designed the seperate part 'sets' like they would've belonged to (in this case) three different robots, and were just swapped out afterwards by some random guy who found them.