Usage Tips:Total Size:12 x 11cm/ 4.7 x 4.3 inch(D*H) Material:Sponge Product Name:Aquarium Filter Sponge Net Weight:28g Center Hole Dia:28mm/ 1.1inch Biochemical Sponge Filter provides both mechanical and biological filtration. Simply install an airline into the unit and provide both aeration and filtration for your fish. In addition, the Cylinder Aquarium Filter traps waste particles mechanically cleaning the water without trapping the fish. The Fish Tank Sponge Filter featuring a weighted plastic base that keeps the unit from floating during use, and cylinder design to dead Lift tube allows the use of power without adapter, increasing its versatility. Easy to clean, simply rinse and squeeze sponge under water. Color:Black Package content:1 x Aquarium Filter Spongespace between the filter Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.