Each model is comprised of two life-size Vertebrae. The first pair shows one set with normal anatomy and one with a "bulging" herniated disk. The second set of Vertebrae shows one with bone and disc degeneration, and the 4th with advanced osteoporosis with marked bone compression and bone spurs 3 3/4 " x 3" x 3 1/8". Spine model 5" x 6" x 1" Grey base included with every model. Made of durable high quality materials
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