3 Musketeers Chocolate Bar from Mars. The one and original 3 Musketeers chocolate bar is a top favorite year after year - only better. Now 3 Musketeers is the lighter way to enjoy chocolate, with 45% less fat than their original bar. The light, fluffy bar topped with real milk chocolate is impossible to resist. Each bar is 2.13 ounces and each box contains 36 bars.