HUMAN HEART BIOLOGY BOX KIT This kit is a fun and informative way to educate the young ones. Our educational Human Biology Kit lets them learn about the heart. Each kit contains detailed do-it-yourself models and an informative booklet to explain key facts about the functional structure of our hearts. For ages 7 and up. Choking hazards- small parts. Not recommended for children under 3 years of age. Box measures 4.5" x 5".