This lightweight neck support, incorporating small magnets and tourmaline, is recommended for those suffering from stiff shoulders and neck, as well as cervical pain, cervical disc herniation, cervical dislocation neuralgia, and headaches. It's a free-size product containing magnetic and tourmaline components, designed for self-heating and improved blood circulation! *If the heat feels too strong, adjust by using a towel.* It's also stretchy and fits snugly around the neck! Easy to put on and take off with Velcro. 【Size】 Approximately 46 x 10cm, approximately 27g *Suitable for neck circumferences of approximately 33-45cm* Carefully inspected as a manufacturer's product.