Safe and Quality Material fish feeding ring is made of high-quality PVC material, which is pollution-free and protecting fish health. The Floating Fish Feeding rings can help fish develop a habit of eating in a fixed position. Reasonable DesignSuction cup suspension, Rotating device, Floating design, When the water level rises or falls, rotating rod repositioning with the water level, the buoyant rubber is embedded in the bottom, Fish feeding ring Always keep floating above the water. Keep the Aquarium CleanThe fish feeding rings keep the food in a certain area, it inhibits the food from floating into unwanted places such as the filter, which allows more of it to be eaten. It is easier to clean up the residual feed, reduce waste, and maintain water quality, increasing more feeding fun. Feeding Ring SizeThe size of the square feeding ring is 4 x 4 in(10 x 8 cm) and the round one is 2.9 x 2.9 in(7.5 x 5.5 cm), suitable for various fish tanks and aquariums. Also, it is suitable for fish, turtles, goldfish, cichlid, guppies, catfish, betta, aquatic pets, etc Restrains Fish From Being BulliesA great way to restrict fish in a community tank from being bullies is to use multiple floating feeding rings. Fill one square fish feeder and allow your more aggressive fish to dash over to eat. Once they are occupied, add floating fish food to a second feeding square for the more timid fish. Bullies cant hog all the rings, so add as many as you feel necessary so all your fish can eat in peace. Material: PVC rubber Color: Black Product Size: Square Feeding Ring: 10 x 8 cm/4 x 4 inch Round Feeding Ring: 2.9 x 2.9 inch/7.5 x 5.5 cm Packing List:2 fish feeding ring.Items from Sheng Xinshun's shopProducts from KJ's store