Features: Fit for 60L deep fish tank. Provides biological filtration to the aquarium, helps to stable water quality. Increase the oxygen solubility. Working noiselessly. Good permeability, easy to clean. Adhere smooth surface with suction cup. It reduces noise from air pump and consumes lowest wattage. No deads spots in cylinder foam offers increased filtration. Specifications: Material: Biochemical cotton Color: Black Size: 15*14*4.5cm Sponge size: 5*8cm Fit for: 10cm ~ 80cm deep fish tank. Water inlet hole diameter: approx. 18mm Attention: 1.Please use aquarium water to wash the sponge, don& 39;t use hot water. 2.Please soak it with aquarium water for 5 minutes before use, It will be easy to digest bacteria colonies. Package included: 1 x Biochemical Filter 2 x Sponges 2 x Suction Cup