The fascia ball is made of rubber material, which is safe, non-, tasteless and long time to use. The fascia ball can release and muscle knots and tension, relieve sore and tight muscles to and revitalize all areas of the body. Simply lean on the massage ball and use your own body weight and gravity to relieve muscle knots and tension. Perfect for use while sitting on any chair, laying in bed, on the floor, or on a yoga mat. Use them , at , or at the gym. The fascia ball is small, portable and easy to bring along on any trip. High Quality and Durable: Our massage Balls are made of natural rubber for premium feel and durability, no harm to skin and body. 100% Solid rubber, no crack and nonslip after repeated use. Colour:blue Material:rubber Size:Diameter: 63.5mm Package Contents: 1 * massage ball Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store