Feature:1. [Multi Layer Principle] This kind of biochemical sponge is designed and manufactured with a multi layer principle, has a large surface area, and does not cause obstacles to water flow.2. [Add Oxygenation] Aquarium sponge filter can generate a lot of air bubbles and increase the solubility of oxygen in the water.3. [Easy To Clean and Ultra Quiet] Sponge filter for fish tank is easy to clean, this filter has no running noise.4. [Premium Material] Biochemical sponge filter is designed with high quality plastic, sponge material, durable in use.5. [For Small Freshwater Fish] Bio sponge design and manufacture is made after extensive testing and is suitable for raising small freshwater fish.Specification:Item Type: Fish Tank Sponge FilterMaterial: Plastic, Sponge.Package List:1 x Sponge Filter 1 x Suction Cup