So much to see and do! Grownups will relish showing toddlers how to stack and build two short or one very tall treehouse. The enclosed 12 stackable pieces can be arranged in dozens of different ways. Independent testers including parents, educators and panelists have selected the treehouse stack-up to receive the National Parenting Center's Seal of Approval - 2016. Ages 18 months+ Measures 4L x 10H x 5W in Measures 10.2L x 25.4H x 12.7W cm All wood toys have non-toxic water based finishes.