Size:Medium Model Number:WWA056 Application:Body Material:PP Product size::370*245mm/14.57*9.65 Product function::correcting spine, improving hunchback / waist acid feature 1:black yoga belt style feature 2:masajeador feature 3:back massager stretcher feature 4:back stretcher feature 5:magic back support 1PCs Back Stretch Equipment Massager Magic Stretcher Fitness Lumbar Support Relaxation Spine Pain Relief Corrector Health Care Features: The 3 gear can be adjusted, and the back bow angle can be adjusted according to needs, so as to suit waist exercise needs. Simulation finger massage, acupuncture touch, advanced PP material, durable, there are 150 massage contacts. Arc stretching, for laying and sitting. Let the waist return to normal 26 degree physiological curve. Specifications: Material:PP Product color: random color Product design: W1 acupuncture colorful style, W2 black yoga belt style. Product size: 370*245mm/14.57*9.65" Product function: correcting spine, improving hunchback / waist acid Instructions: 1. Put the spinal correction plate on the bed or stall, adjust the appropriate tensile strength. 2. Place the spinal correction plate behind the buttocks, and the rear part of the product faces the buttocks. 3. Lie down slowly. 4. Correct posture: sideways and arm support. Quantity: 1 X M assager