Learning the anatomy and bone structure of the human head can be fun! This Realistic Anatomical Puzzle features: Exploded Skull 1:2 Model/Puzzle W 17 Parts, Bone parts Combine together to form a complete skull, An excellent skull model to study the bone structure of the human head, Quality suited to medical educational purpose. Approximate Size:3.4 inches (87 mm) long? 4 inches (102 mm) wide? 5.6 inches (146 mm) high Ages 8 and up.