Balls & Bones Glow & Go Balls for Large Dogs Durable retriever ball that glows after exposure to light. Available in your choice of color! Two 3-1/2" glow balls for larger dogs. Insures you always have one ready. Soft, textured surface makes it easy to fetch & throw. Easy-to-clean waterproof ball floats in water for added fun! Made from 3P-Free non-toxic materials. Shrink-wrapped to insure they arrive clean & safe!