It's called Thinking Putty.
The ultimate stress reduction toy is here. Of course you remember playing with putty as a kid. Thinking Putty is a stretchable, bounce able, moldable, tearable, magnetic, and all-around fascinating toy. While you do whatever you want with it, your brain relaxes and opens up to all kinds of creative thinking. You can bounce it, stretch it, and tear it -- all of which are loads of fun.
Play with light like never before with Glow in the Dark Thinking Putty. Each handful of putty looks normal in the light, but enter a dark room and watch it brightly glow.