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 both aeration and filtration for your fish. In addition, the Cylinder Aquarium Filter traps waste particles mechanically cleaning the water without trapping the baby fish. The Fish Tank Sponge Filter featuring a weighted plastic keeps the unit from floating during , and cylinder design to eliminate dead tube allows the of head without adapter, increasing 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 and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.