Features: Acupressure treatment is safe to use without side effects, oral infection or harm, which can stimulate acupressure point to reduce or eliminate . Specifications: Weight: Approx. 65g Function: Relieving and Aiding Sleep Size: S: 4.5-5.1cm / 1.8-2.0inch M: 5.2-6.0cm / 2.0-2.4inch L: 6.1-7.5cm / 2.4-3.0inch Package Included: 1 x Anti Loop Warm Tips: will be relieved for most people that night, and will get better in 15 days generally. Heavy like sleep apnea and so on is not suitable to wear this loop.