nunki trend Lumbar Back Pain Relief Device Lumbar Back Stretcher for Lower and Upper Back Massager and Support.A convenient at-home back pain treatment and preventative care product for people of all agesTough and thick hi-tech ABS plastic for long durabilitUnique design according to human body's physiological curve of the spine better eliminate the source of back painMulti-level adjustments: 3 different height level stretching arch choose the suitable level for your body and exercise your back in a healthy wayGreatly help to relieve chronic back pain and correct postural imbalance restore the natural curvature and improve flexibility in shoulder and back musclesUse as daily traction therapy: thumb tip nodes on product surface like massage stimulate the back points and promote blood circulationSimple and easy to install and use lightweight and portable to use in travel at home or office Direction: Comes in separate parts. Assembly required Please start stretching slowly to prevent muscles excessive pain Please stop if you feel uncomfortable and consult your doctor