A question relating to mozzarella cheese?

The local grocery store is having a "guess the weight of the cheese" contest. The cheese in question is one of those big cylindrical mozzarella cheeses (~ 3 feet long x 8 inches dia) with the ropes knotted around it (looks like cheese in bondage, you usually see them hanging in the Itallian food stores). I suspect these cheeses are made in a fairly standard size/weight, does anybody happen to know what that weight is? If not, does anybody know the density of mozzarella cheese? (All the technical treatises I consulted were sadly deficient in the area of chese density). Thanks.