This specimen was cast from a real human fetal skull. Estimated to be 21 1/2 weeks old, this skull exhibits characteristics of prenatal development. This specimen is an excellent aide when studying human fetal osteological development.nnSpecifications:nn1:1 scalenPolyurethane resin castnn1-part skull (jaw glued to cranium)nnSkull Length 5.7 cm (2.2 in.)nnSkull Width 4.5 cm (1.7 in.)nnSkull Height 4.5 cm (1.7 in.)nnProduct of Bone Clones