Light Up DNA Stress Ball, the squeezable ball that lights up your life. Here’s what makes this an ultimate sensory experience. Ultra soft, flexible, thermoplastic, elastomer cover on the outside provides soothing tactile stimulation. Soft, translucent mini spheres in assorted bright pastels inside invite kneading that relieves tension.Plus for added visual delight, a LED ball that lights up when squeezed. Pick one up and play. Feel your stress melt away as fingers become more flexible and hands stronger. This light up stress ball measures 2 1/2″ diameter. Since everyone benefits from moments of relaxation, consider a 12-pack.