Beat the sand, rice and water problems now! Economical Playplas makes a great substitute. Playplas Sand, a non-toxic granulated polyethylene based plastic. Sweep itup easily from any surface and wash clean from time to time with no harmful effects. A beautifully tactile, sensory material for use in the Junior and Middle School. Develop early experiences in volume capacity and mass concepts: strengthen them later with formal measurement. In addition the easily portable containers allow groups of 3-4 children to explore together.