Color changing gell stress relievers offer a "wow this is nice" feature to a classic promotional item, stress relievers. Liquid-filled gel ball changes colors when squeezed. Great for stress relief, physical therapy and exercise. The gel ball is environmentally friendly. Gel items are stress relievers with a TPR outer layer and various textured materials inside. Gel balls are non-toxic and are intended for adults or for general use by consumers of all ages. Gel products are not intended for children under 3 years old and pets.