Potrisers are 100f% recycled material and eco-friendly. They are invisible pot feet that fit under containers and statuary to protect your patios and decks from staining and rotting. While remaining hidden, Potrisers can be placed under planters and statuary. The rubberized material grips pots and surfaces while providing cushioning on uneven surfaces such as aggregate. They can be stacked to level planters or statuary on sloped surfaces as well. Potrisers are designed to protect and hide drip lines and allow for easy cleaning and discourage bug infestation while providing crucial drainage needed for healthy plants. By "floating" planters off the ground, pots are less likely to freeze and crack in cold temperatures. POTRISERS are not recommended on surfaces containing vinyl