This massage ball has small size and simple design. It is easy to use and you can take it with you at anywhere you want. It is a nice self massage tool.Features:It is portable and suitable for indoor and outdoor use.Peanut-shaped bump design makes it massage your neck， shoulder， back， feet and other parts of the body effectively.It eliminates sore and aching of muscles and remove fatigue of your body.It promotes blood circulation.A nice self massage tool.Specifications:Type: Massage ballColor: BlackMaterial: Silica gelDiameter: Approx. 6.5cm / 2.56inLength: Approx. 12.5cm / 4.92inItem Weight: Approx. 320g / 11.29ozPackage Size: Approx. 12.5 * 6.5 * 6.5cm / 4.92 * 2.56 * 2.56inPackage Weight: Approx. 323g / 11.39ozPackage List:1 * Massage ballNote:Please allow 1-2cm (0.4-0.8") differences due to manual measurement， thanks.