It is made from high quality pliable Polyfoam. Delightful, soft and squeezable stress ball. Therapeutic, this ball is great for relieving mental tension in your body, increase strength, and soothe the mind. This round ball stress reliever is perfect for trade shows, conventions, wellness campaigns and other promotional events. Have your company logo or custom design imprinted on the surface for maximum brand awar. 2 15/32" Diameter.