Simulated robots forming the chests and lungs, it uses rubber sponge rubber how to make pictures with static. So the tires have a density closest real tissue.
The forming model of breast and lung models that use this technique to make do with sponge rubber vulcanizates. The rubber has a density close to that tissue.
The forming simulation of chest and lung simulator figurine that use techniques do Yang picture how to make rubber sponge. In order to nearby tissue density rubber.