Jelly Marbles - Clear Spheres (50 gram jar)
Jelly Marbles - Clear Spheres (50 gram jar) by Steve Spangler Science at Bio Social Change. MPN: WSAS-550. Hurry! Limited time offer. Offer valid only while supplies last. Superabsorbent growing polymer water beads that absorb 300 times their weight in water and grow into a perfect sphere that looks like a water marble.