The Garden Gecko UK Invisible Pot feet for outdoor plant

I am using a combo of four + different types of pot risers, and each seems to have a place. My particular application for these was for a heavy pair of concrete urns that are each sitting on top of a couple of large pavers at the top of a driveway. The rubber-like feet help with drainage flow and also keep the planters from sliding on the pavers as they otherwise do. They appear to be made of a strong and durable material. I like them very much. Their color is discrete such that they aren’t noticeable. I wouldn’t use these, however, for planters that get moved frequently, since it would be tedious to continuously reinstall 3 or 4 feet for each unit.