The aluminum foil paper is a metal and its texture is soft, ductile and easy to tear. The tin foil has a very good finish and heat reflectivity. With the protection of the tin foil, the taste of the gum will not be affected by external stimuli. More importantly, it will not be changed by the air and the environment. Sugars don't spoil, making them last longer. There are also thermal and aesthetic factors in it. It doesn't melt easily even in your hand, so there is a layer of aluminum foil inside the gum.