Parmesan

A disc of Parmigiano Reggiano cheese weighs between 30 and over 40 kilograms (66 to over 88 pounds), on average about 40 kilograms.

An excerpt from the article 18 facts about Parmesan

It takes about 550 liters (145 gallons) of milk to produce one disc, with an average of 14 liters (3.7 gallons) per kilogram of cheese.