This model features 4 pairs of life-size lumbar vertebrae in 3 stages of degeneration. Shown are a normal pair of lumbar vertebrae, a pair with a bulging herniated disc, a vertebrae set with bone and disc degeneration, and finally, advanced osteoporosis with serious bone compression and bone spurs. Models do not dissect but can be removed for individual inspection and study. Includes removable patient education cards. Size: 3-1/2" x 3-1/4" x 3" each. Base: 5-3/4" x 10-1/2".