Use in the classroom to show birthing passage through the pelvis (approximate 4-inch/10.2cm passage diameter; stationary, not flexible); Students use to study instead of making late-night trips to library Model can be closely examined from all sides; overall dimensions make this human bone model life-size; Model comes preassembled and we do not recommend dissembling; Materials: Model constructed from PVC plastic; Symphysis pubis constructed from rubber for realistic emphasis and demonstration; Stationary - Joints are held fixed with screws Colour:White Material:PVC Size:. 26 x 19 x 15cm Package Contents: 1X 1:1 Female Pelvis Model Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.