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Dive into the magic of Swell Polymer Rainbow Spheres! These curious spheres soak up water like tiny sponges, swelling into soft, colorful hydrogels. Made from a special super absorbent polymer, they pull in water through a net-like molecular web, growing bigger and more vibrant right before your eyes. Perfect for playful experiments, sensory fun, or brightening up any space with a splash of color! Watch them swell and transform—it's science you can see and touch! Ages 8+; 5" x 2"
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🇺🇸 Ship from USA · On Agora since 2026
$10.00