Back Stretcher for Lower Back Pain Relief, Multi-Level Lumbar Support Stretcher Spinal Back Massager, Back Muscle Pain Relief Spine Cracker for Sciatica, Herniated Disc, Scoliosis, Spinal Stenosis * PAIN STRESS RELIEF & POSTURE IMPROVEMENT – The Back Massage Stretcher has ergonomically designed. Has 98 plastic pins that brings acupuncture effect by deeply pressing the specific acupoints. With flexible and soft rubber mat in the middle on the back board to helps cushion impact force, give your waist better protection. using this back posture corrector daily restores the natural spinal curvature and improve your body posture . * 4 LEVEL OF ADJUSTMENT-The back cracking device has 4 levels of adjustment funtion, which can be adjusted according to your own bearing conditions to desired stretch and comfort.