A little container, half full with milk, it floats inverted, a little push, down it goes. The air inside is compressed, the water suffers no change. No change either with Cadbury Dairy Milk Chocolate. It has the natural goodness of a glass and a half of full cream milk in every 200 gram block. If you want substantial nourishment and enjoyment, remember, when you think of chocolate, think of Cadbury.