Color Changing Heat Sensitive Slime Putty: Kid friendly colors are:Green2Light Green, Purple2Pink, Purple2Blue, Red2Yellow | Kids Putty Entertainment that Changes Colors: Occupy your fidgety hands while sitting at your desk or talking to your girl friends. Take the slime putty along for a bus ride or on an airplane. Give this amazing set of putty a party favor. Goody Putty is perfect for anytime! | Sensory Squeeze for Squishy Stress Relief: Goody Putty heat sensitive color changing putty will give you the kinetic and tactile input you crave while simultaneously strengthening hand muscles and improving focus and mood. Just give the slime putty a squeeze to relieve tension. | Safety: All Goody Putty products are non-toxic, odorless, and safe for children ages three and up. | Amazing Toy or Activty: Bright colors, fun for games, gets you thinking and enhances creativity, putty slime pack of four can be used for any party or craft day.