This all-natural, non-toxic, economy-priced modelling material has been especially designed for classroom use. It’s a clean white compound that is ready to use out of the package. No messy mixing or kneading required. It can be shaped or moulded and air dries hardened (not spongy) in one to three days. It may even be sanded or carved after it’s hardened and then painted with acrylics, tempera, markers, etc.