Roberta's 6 pc. Wondrous Plant Hanger System is Roberta's Wonder Plant Hanger and Pot Holder is the perfect hanging system for any container, indoors and outdoors. It's made of a high impact, weather resistant material. They look great on a fence post, deck railing, in a row under a window, even on a brick wall! The ultimate plant hanger can also be used to hold terra cotta pots by removing the arms.