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
This is an original GPI model and we are an Authorized GPI dealer, so this product comes with a 3 year warranty from GPI.