Add storage, additional work/play opportunities, or replace existing trays with the Early Childhood Resources Replacement Station Sand & Water Square Trays with Lids - Set of 4. Choose from blue, red, or yellow. For use by children ages 3 and older, with adult supervision. About Early Childhood Resources Early Childhood Resources is a wholesale manufacturer of early childhood and educational products. It is committed to developing and distributing only the highest-quality products, ensuring that these products represent the maximum value in the marketplace. Combining its responsibility to the community and its desire to be environmentally conscious, Early Childhood Resources has eliminated almost all of its cardboard waste by implementing commercial Cardboard Shredding equipment in its facilities. You can be assured of maximum value with Early Childhood Resources.