Crazy Aaron's Thinking Putty is a lot like the Silly Putty you remember. You can squish it, bounce it, stretch it, snap it... but Thinking Putty is extra special. Firstly, you get wayyyy more of it (over 4 ounces!). Secondly, they all have special properties. Liquid Glass is completely transparent. Made in the USA and great for ages 6 and up!