Experience the fun and ingenuity of Spit Balls! Simply add Spit Balls to water and watch in amazement as they expand over 200 times their size! Spit Balls are fun to bounce, roll, and throw! They even slip, slide, and explode. Spit Balls are completely reusable and can be dried out and hydrated over and over again for hours of educational fun. Spit Balls are safe, non-toxic, and environmentally friendly.