Making bouncy balls

I got my husband this snazzy kit for christmas that you can use to make bouncy balls. Today we made the balls together. It was really cool! It comes with these sachets of PVA (the same stuff that school glue is made from) and you just fill up the molds and leave them in a cup of water for two minutes. When they're done, they really do bounce! Above is a picture of the ones we made.

They remind me of big candies. Or small planets. The green one glows in the dark, and they really do bounce! Usually we can't order stuff from overseas, but on this occasion I ordered it to my parent's house and they brought it over.