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Neck Massage Pillow Neck Shoulder Cervical Chiropractic Traction Device Massage Pillow for Pain Relief Body Neck Massager Type:Massage Pillow Size:22x17.5x12.5cm Material:PU Polyurethane Usage method Friends, our products are made of PU. 1. Use hot water, the water temperature is lower than 55 ℃ 2. Heat the pillow in hot water, 3. Dry the pillow, put it under the cervical vertebra, and sleep for 8 minutes Features: 1.V-shaped curvature, support and fix the position of the cervical spine. 2.Press the pellets to relax the muscles on both sides of the cervical spine. 3.C-shaped opening, the downward pressure is elastic, resulting in deformation, and the support strength is enhanced. 4.Cervical vertebra guide groove, guide the correct posture when using.usage method