cosmo beads magic balls- 13600 crystal jelly beads grow in water - fun for all ages (pink) cosmo beads cosmo beads water balls start as tiny hard balls but quickly grow many times their original size when you add water. this rainbow mix of water beads will keep your children and their friends busy for hours. they make a fun game, great learning tool, science experiment, sensory play. they are called by different names: jelly beads, spa beads, gel balls, jelly water marbles, water jelly beadz, and sensory balls. they are also perfect budget-friendly orbeez refills and can safely be used in all orbeez products like the crush and soothing spa. they make a great addition to learning resources like the helping hands fine motor toolset, handy scoopers, and science lab kit. cosmo beads water balls are nontoxic, colorfast (won't fade or bleed), and non-flammable.