[COLOR CHANGING PUTTY]: Watch them change colors with your body heat, The color of the plasticine changes when the temperature reaches 32°. As the temperature decreases, The color gradually restores.[PRODUCT DESCRIPTION]: 1.76oz Putty with tin box, Material it is made of silicone, Can pass the heavy metal test, Heat adaptation test.[MOLDABLE & MESS-FREE]: Stretch, Fold & pull the putty to mold it into various shapes to exercise the hand while increasing concentration. The play putty also doesn't stick to your hands - only to itself.[FEATURES]: Slime toys is especially suitable for teens who love science, Challenge your children's imaginations and good if you want to explain Color Changing to your children. Also a good stress relieve toy for adults.[SUPER COOL GIFT IDEA]: Play putty isn't just for the kiddos anymore! Our putty makes an excellent gift idea for over-stressed coworkers, Employees, bosses, college students, etc.