Play N Learn Magical Clay is actually a putty that kids love to play! Watch its colour change when there is a change in temperature! When you keep rubbing the putty, introducing heat to it, the colour will become lighter. In fact, the green putty at room temperature will change to yellow putty. Like Magic! It is lightweight, non-sticky, bouncy, stretchy and safe to play with! Able to mould into any shapes you like. Age appropriate for 6 years old and up.