The differences between muscle and body fat become crystal clear with this set of models. Set features bulky 1- and 5-pound Fat Chunk models and dense 1- and 5-pound muscle models, each begging to be picked up and examined for closer inspection. It quickly becomes clear that muscle takes up about half the volume of fat, even at the same weight, reinforcing the importance of healthy eating and physical activity. Weights of models are approximate and may vary slightly. Set comes with informative, two-sided tent cards and carrying cases.