A convenient back pain treatment and preventive care for people of all ages Sturdy and thick high-tech ABS plastic for long durability, Unique design according to the physiological curve of the human body's spine, better eliminate the source of back pain Multi-level settings: 4 different stretching arch height levels, choose the right level for your body and exercise your back in a healthy way Strongly help relieve chronic back pain and correct postural imbalances, restore the natural curvature and improve mobility of the shoulder and back muscles Use as daily traction therapy: thumb tip knots on the product surface like massage, stimulate the back points and promote blood circulation, simple and easy to install and use, light and portable to use when traveling, home or office < or li> Product s Color: Blue and Black Establishment Suitable for people of all ages who want to stretch their whole back, especially those who sit in front of the computer all day with little movement Please read all s carefully and the size chartAny questions, please feel free to contact us Product Type: Back Extension Support Material: ABS plastic and sponge Color black Height from the floor: Adjustable 6cm or 10cm or 12.5cm or 14cm Massage function: acupuncture Working function: Lying on the back stretcher, gravity allows the front of the body to effortlessly stretch up and down. Then the surrounding muscles begin to relax, gently decompressing the vertebral discs, and realigning the spine, thereby relieving tension and pain Direction: Comes in separate parts. Assembly required Please start stretching slowly to prevent the muscles from sore too much If you feel uncomfortable, please stop and consult your doctor Package include: 1 x back extensor