A GellyBall is like an Orbeez. GellyBalls are teeny tiny absorbent polymer beads that expand into small beads when soaked in water. They are biodegradable and nontoxic. They will not hurt your pets, plants or grass. Unlike paintballs that explode upon impact, GellyBalls simply bounce off or disintegrate âÂÂ then they dehydrate! No stain, no mess!