Crazy Aaron's Thinking Putty introduces this make your own bouncey ball activity set! Create your very own high-bouncing ball with Crazy Aaron’s X Ball kit! Just choose your colors, effects, and patterns to design an awesome toy that lasts forever. The kit includes two special compounds that, when mixed together, creates PermaPutty -- a brand-new technology from Crazy Aaron’s that allows for permanent molding. Place your custom-mixed PermaPutty into the mold, wait for the putty to cure, and enjoy hours of fun with your completely customized X ball.