Totally cool science fun for the little people. We did an explosion show with the grandparents. Lots of fun to make on a day where you have a little time. Helps kids understand chemical change with eruption. Can erupt over and over and over...

I didn't find the molds difficult to use at all. I used a rubber band to hold the four sides together as the plaster was drying. We have made four ourselves and given a few away as birthday presents. Always a favorite. Can't find any--it would be great if there were a way to have more than one volcano per package.