Horrible Science Galt - Bouncing Eyes

Did you know there are eyes that glow in the dark and bounce? Well, they are not real at all, and they can be created with Galt's magic kit – Horrifying Science. It contains everything needed, as well as a science sheet with explanations of why the balls bounce.
The kit contains materials for making 3 small eyes and one larger eye, which is achieved with:

8 packets of special crystals

Large ball mould

Small ball mould

Measuring spoon

Funnel

Instructions