Slippery Spheres are fun to throw, and they slip, slide, bounce and explode! To experience the ingenuity of this exciting product, simply fill a cup or bowl with water and add Slippery Spheres. In less than one day, they expand to over 200 times their size as they grow to the size of a marble! Let your imagination take over as you experiment with Slippery Spheres! Completely reusable for use over and over and safe for ages 4 and up. Non-toxic and environmentally friendly. Each bucket contains over 5,000 spheres!