This model is a four-stage lumbar spine model that demonstrates different degrees of diseased lumbar spine. the simulation model has a high degree of reduction. made of imported pvc, artificially worn, and excellent workmanship.specifications:product name: four-stage lumbar spine modelproduct material: pvcproduct size: 26.7*15.5*9cm/10.51*6.1*3.54inpacking size: 27.5*16.5*11cm/10.82*6.49*4.33inproduct weight: 0.8kgpackage included:1 x lumbar spine model1 x basefor problems such as damage or quality problems after receipt please write to us at any time.we offer you the best solution.if you have product problem, please contact us and we want help you solve the problem.we will answer your email within 24 hours.s if you have any questions.offers a full range of budget friendly, detailed anatomical models for exceptional value, great for medical students and professionals alike. all of our products are professionally and purposefully designed with anatomy specialists and students in mind.