The Wonder Balls is a type of candy, sold in the United States by the Frankford Candy & Chocolate Company.
Wonder Balls are a spherical, thin shell of milk chocolate with candy inside, wrapped in foil, placed in a small box, wrapped in linen cloth, placed inside of a gun safe, which is further protected via a varying number of ancient Egyptian technologies, placed inside of the Ark of the Covenant, and packaged with a collectible sticker. It is theorized that the reason that the Wonder Ball is no longer produced is because of the unique but very difficult production process of the Wonder Ball, considering that every time one is sold, they must recover the Arc of the Covenant in order to produce another one in the same spirit of the original Wonder Ball. It was also very inconvenient for the small children who simply wanted to eat a chocolate treat, considering that they needed to open the Arc of the Covenant, outwit the ancient Egyptians, and crack a gun safe.
Straight from the wiki page.