Use or Back Power Source Manual Material Stainless Steel Item Weight 367 Gs Principle of physical spinal pressure massage: This device mimics the massage of a human hand, adjusts the bones, straightens the spine, and effectively eliminates pain, making users feel more energetic. It can penetrate the skin up to 2.3cm, effectively adjusting the bones, and a single massage session can extend relaxation time. 10 Level Setting: The manual chiropractic device offers 10 adjustable levels, ranging from 30N to 300N, with increments of 30N. It features 4 functional settings: its exquisite workmanship and interchangeable parts allow one device to be used for multiple positions, catering to the needs of various individuals. Instructions for use: 1. Place the handle in the palm of your hand. Position the rubber on the area to be massaged and apply force. Pull the black part of the device into the palms of your hands and then pull it back and forth. 2. If used frequently, it is recommended to add lubricating oil. Easy to Use: This lightweight, portable, and sturdy device is ideal for home treatment. Just 15 minutes a day can provide more effective relief for back pain than a full chiropractic treatment. The set is made of 304 stainless steel, which is rust-proof, heat-resistant, cold-resistant, and has good mechanical properties. Body Massage: It provides stable and powerful force, offering a more effective and comfortable massage, suitable for scoliosis, thoracic, and spine pain. It can be used for joint relief, cervical adjustment, thoracic massage, cervical massage, and full body care.