The Oiiki 10 Pcs Fish Feeding Rings Sets are floating aquarium plant corral accessories designed for fish tanks. Made of foam material in black-oval and square shapes, these feeding rings have a nominal outside diameter of 8.27 inches. Perfect for creating a feeding area for fish in your tank, these sets include everything you need to help maintain a clean and organized feeding space for your aquatic pets. Ideal for pet owners looking to enhance their aquarium's ecosystem, these feeding rings are easy to use and effective in managing your fish's feeding needs.