Size:Square Size: 10 x 10 cm, inner diameter: 8 x 8cm; Round Size: 7.5 x 7.5cm, inner diameter: 5.5 x 5.5cm. Premium Material: Round and Square Feeder floating food circle is made of plastic and sponge,non-toxic and odorless, no pollution to water, not harmful to all aquatic pets. Powerful Suction Cup:Transparent powerful suction cup,With strong suction cup can prevent fish food from floating,prevents the feeding ring from changing position with the drift of the water.Controls food dispersal to reduce food waste, and keep water clean. Application: Suitable for all flaky, granular, various shapes, with floating fish food,for fish, turtle, gold fish, cichlid, guppies, catfish, betta, aquatic pets such Controls food dispersal to reduce food waste, and keep water clean. Package Include: 2 pcs square shape floating food feeder circle, 2 pcs round shape floating food feeder circle, 4 pcs in total.