Product description Size: 6.7*7cm Color: white material: plastic Package content: 4pcs hopper feeder 1.【Material】:Made of plastic, eco-friendly, safety. 2.【Installation】:Comes with suction cup, free-floating or attached to the side of the aquarium with the suction up. 3.【Apply】:Live food funnel floating for red worms feeder and solve eating trouble of small food in the tank for fish. 4.【Protect environment】:Protect live food spread to go to throughout in aquarium tank. 5.【Have powerful electromagnetic sucker】:removable, not easy to fall off.