Just lying down for 8 minutes a day can realign your cervical spine. Relaxation and acupressure effects on the cervical spine can be expected to improve stiff shoulders and straight neck. It's a reversible design, allowing you to adjust the intensity of the stretching effect depending on the direction you use it. Made of resin, it's lightweight, convenient to carry, and can be washed with water for hygienic use. How to use: Method 1: Place the product flat, lie down, and then naturally relax your neck, using the weight of your head for a massage stretch. Method 2: Secure the product in the correct posture, lie down, and then shake your neck from side to side to achieve a neck muscle massage effect.