Whoppers are malted milk balls covered with a chocolate-flavored coating produced by The Hershey Company. The candy is a small, round ball about 3/4 of an inch in diameter. They are typically sold either in a small cardboard candy box, in a larger box that resembles a cardboard milk carton, the Fun Size variety which is a tube-shaped plastic package sealed at the sides, containing twelve Whoppers weighing 21 grams (0.75 oz), or the even smaller variety of a tube containing three Whoppers weighing 6.8 grams (0.23 oz). In 1939, the Overland Candy Company introduced the predecessor to Whoppers, a malted milk candy called Giants. Overland merged with Chicago Biscuit Company, Leaf Gum, and Leaf Machinery, in 1947. Two years later, Leaf Brands reintroduced malted milk balls under the name of Whoppers. All products manufactured by Leaf Brands were purchased by W.R. Grace in the 1960s; however, they were repurchased by Leaf in 1976.