Tiny growing beads with a superabsorbent polymer secret.When you open up this jar of Jelly Marbles, you might be surprised. These tiny, hard beads don’t resemble the clear spheres you were promised. Don’t worry, all you have to do is add water! Soak those tiny beads in water overnight and the results are a wealth of jiggly, squishy marbles that are over 6x their original size. Take it further! Drop full grown Jelly Marbles in water and they vanish….it’s a cool demonstration in light refraction. You can even use the included Colour Fizzers tablets to change their colour!