No. It would be cool to do this in principle, but the difference in scale is so colossal that it would make for a ridiculous set of pins. For example, Mercury (the smallest planet) is 4,878km in diameter. If we were to make that a 1mm diameter pin head (which would be TINY!), at the correct relative scale, the Jupiter pinhead (the largest planet at 142,800km in diameter) would have to be nearly 30mm in diameter. Like a grain of rice and a grape. Within the Planet Pins pack, The smallest planet is the smallest pin and the second smallest pin is the second smallest planet and so on, but they are not of true scale to each other. The Moon pin breaks this trend as it's not part of the main pack. The Moon pin is roughly the same size as Neptune.