Total Size: 12 x 11 cm / 4.7 x 4.3 inch (D*H) Material: Sponge Product Name: Aquarium Filter Sponge Net Weight: 28g Center Hole Diameter: 28mm / 1.1 inch Biochemical Sponge Filter provides both mechanical and biological filtration. Simply install an airline into the unit to provide aeration and filtration for your fish. The cylinder aquarium filter traps waste particles, mechanically cleaning the water without trapping the fish. The fish tank sponge filter features a weighted plastic base that prevents floating during use, and a cylinder design to reduce dead spots. Lift tube allows the use of a power head without an adapter, increasing versatility. Easy to clean simply rinse and squeeze the sponge under cool running water. Color: Black Package Content: 1 x Aquarium Filter Sponge Note: Light reflection and different displays may cause slight color variations between the item in the picture and the actual item. Measurement allowance is +/- 1-3 cm.