specification: Item Type: Yoga Massage Ring_x000D_Material: PP_x000D_Suitable Crowd:_x000D_1. People who are sedentary at work with back pain._x000D_2. People who want to change their body shape._x000D_3. People with swollen calves due to running._x000D_4. People who want to use yoga for fitness. Features: 1Humanized double arc design fits the waist and neck curve to relax the upper limb muscles. 2Designed with protrusion particles, used for massage muscles and to help reduce the pressure of fascia. 3You can use it in your yoga class to improve posture, toning your body safely and effectively. 4Made of premium PP material, safe, non?toxic and tasteless, easy to grip and adjust the width. 5With an srch shape, it can bear heavy pressure and will not deform or break even under severe exercise. PackageList: 1 xYoga MassageRing