How to Use: 1. When in use, it is forbidden to hit the air, and there must be a strong point on the rubber head. 2. Adjust the bottom according to the needs of use. 3. Place the handle of the bone‑setting massager on the palm of your hand. Place the rubber head on the part to be hit and apply downward force. Pull the black part of the position onto the palm, and then pull it back and forth. 4. When using high frequency frequently, please add lubricating oil appropriately. Specification: Condition:100% Brand New Item Type: Manual Spine Massager Material: Stainless Steel Six-Stage Strength: 50N, 100N, 150N, 200N, 250N, 300N Function: Massage the Body, Relieve Joint Pain, Adjust Bones. Package List: 1 x Bone Setting Massager 4 x Function Head 2 x Rubber Head 5 x Rubber Rings 1 x Storage Box 1 x English Instruction