Goo Lab!! 3 versions to collect, our putty is not just goo, it’s a brain-boosting experience. Crystal Putty - Transforms from clear to a cloudy white finish the more you play with it. Glow-in-the-Dark Putty - Charge it up with light and watch as it comes to life in the darkness. Pearl Putty - The more you knead it, the more it shimmers! Sold individually. Colours will vary