Orbeez are wet and wacky, soft and squishy, fun and funky, bouncy and beautiful. They start off hard and tiny. Add water and watch them grow to more than 100 times their volume. Orbeez have three big wows you'll love the wow of growing them, the wow of touching them and the wow of playing and displaying them. Each Color Pack contains 1000 Orbeez in 9 colors that's three and half cups of grown Orbeez. And you can use the Play N' Display Tray to play games like Four in a Row and make designs. Orbeez (R) are super absorbent polymers. A polymer is a large molecule consisting of many smaller molecules, which are joined together. They are classified as super absorbent because they can absorb up to 150 times their own water. The water is absorbed into the spaces between the molecules. These polymers were invented for agriculture use to irrigate plants during times of drought. Today they are used, among other things, in food packages to absorb liquid and in diapers to prevent leaks.