Since the volume of fuzzballs is a function of the Schwarzschild radius (2,954 m per ), fuzzballs have a variable density that decreases as the inverse square of their mass (twice the mass is twice the diameter, which is eight times the volume, resulting in one-quarter the density). A typical fuzzball would have a mean density of . A bit of such a fuzzball the size of a drop of water () would have a mass of twenty million metric tons, which is the mass of a granite ball 240 meters in diameter.