each kinder surprise egg consists of a chocolate shell, a plastic container, the contents of said container, and an external foil wrap.
the chocolate shell is shaped like a chicken's egg. it is only about a millimeter thick, and consists of two layers: a milk chocolate layer on the outside, and a white chocolate layer on the inside. the shell is not a singular piece of material, but rather two identical halves split down a vertical line. these are lightly fused together just before the egg is wrapped, to prevent the halves from coming apart under the light pressures expected during transportation.