4 years & up. Invite children to explore human anatomy with this 24-piece puzzle. The puzzle depicts both internal organs and bones so that children can investigate multiple dimensions of the human body. Human body puzzles provide a holistic learning experience that combines cognitive, physical, social, and emotional development in a fun and engaging way. It also helps children develop critical-thinking skills as they solve the puzzle and fine-motor skills as they put it together. Measures 18" x 24". 24 pieces.