The APZDFGIFCD 4 Pcs Fish Feeding Ring Square and Round Aquarium Fish Feeding Ring Floating Food Feeder is a convenient way to keep your fish fed. Made of environmentally safe plastic, this feeder is non-toxic and odorless, making it perfect for use in any aquarium. The feeder comes with a matching black suction cup to hold it securely in place. With easy operation, the feeder is simple to use: just place the suction cup on the inner wall of the aquarium and put the food in the feeder to prevent the food from drifting around and even entering the filter. The APZDFGIFCD 4 Pcs Fish Feeding Ring Square and Round Aquarium Fish Feeding Ring Floating Food Feeder is a great way to reduce food waste and keep your fish tank clean.