Deluxe Flexible Spine Model with Femur Headsl by American 3B Scientific. In addition to all features of the Classic Spine Series our Deluxe Spine Model has a sacral opening and exposed brain stem for advanced studies of the anatomy of the human spine. Other features of the this high quality spine are: Stand is not included with this spine model. Stand could be purchased separately - Item A59/8 NOTE: 14-day return.