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Jelly Marbles Test Tube

$7.99 
Brand: Steve Spangler Science
SKU: 3507
Age: 6+

Place these tiny, solid spheres in water, and in just a little while you will have your own Jelly Marbles that absorbed over 150 times their weight in water. These superabsorbent water marbles are the newest craze around the Spangler Science offices! What starts out as a 3mm pebble, quickly becomes an approximately 20mm ball of jelly!