These Pedestals are constructed of exterior grade ply-board, kiln-dried hardwood and exterior grade, non-toxic paint. Pedestals are to be placed on a flat dry surface, such as stone or cement. They should not be placed directly on grass or dirt. You may use a base of pressure treated wood beneath the underside of the pedestal footing or base and then secure the bottom of the pedestals to the platform. With time, the pedestal will need to be refinished when left outdoors.