Colourful, water-absorbent spheres that expand when soaked.Drop these tiny sphers in water and watch as they grow into big, colourful Orbs. These bouncy, squishy balls aren’t just fun – they teach about the awesome science of polymers. Orbs are made of a superabsorbent polymer, similar to what makes a baby diaper work so well. These polymers expand as they slurp up a ton of water. Meanwhile, a second, non-absorbent polymer holds the awesome spherical shape and vivid colours while the Orbs grow up to 7 times their original size. Orbs are a polymer that you have to see to believe!