In practice, the Canopic jars are Egyptian funerary furniture made of a variety of materials, including alabaster, bronze, wood, and pottery. Each of the 4 Canopic jars in a set is different, containing only the prescribed organ and dedicated to a specific son of Horus:
- dedicated to Imset (human) held the stomach and intestines
- dedicated to Hapy (baboon-head) held the small intestines
- dedicated to Kebehsenut (jackal-head) held the liver and gall bladder
- dedicated to Duamutef (falcon-head) held the lungs and heart.
The heart was kept within the body and the brain wasn't considered important enough to be preserved, so there were no canopic jars for these two organs.