In the manufacturers description, it says 34;8 proportionally sized planets34; which is incorrect. I did not expect the Sun or gas giants to be to scale, but I thought the Earth, Moon, and Mars would be right. If the Earth is 7.5 inches in diameter (as in this set), the Moon should be 2 inches in diameter instead of 5 inches. Mars would be 4 inches and not 6. If you are looking for something to show the scale of the smaller inner planets, this is not a good set to purchase. The hand pump did work well and made inflating them much easier but the graphics are extremely poor. It is hard to tell the difference between the Moon, Mercury, and Pluto.
Rating: [2 of 5 Stars!]