Total Size: 12 x 11cm/ 4.7 x 4.3 inch (D*H)Material: SpongeProduct Name: Aquarium Filter SpongeNet Weight: 28g/pcCenter Hole Dia: 28mm/ 1.1 inchBiochemical 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 mechanically traps waste particles and cleans the water without trapping fry. The fish tank sponge filter features a weighted plastic base that prevents the unit from floating during use, and cylinder design to eliminate dead lifts. The tube allows for powerhead use without an adapter, increasing its versatility. Easy to clean, simply rinse and squeeze the sponge under water. Color: BlackPackage Content: 3 x Aquarium Filter Sponge space between the filterOnly the above package content, other products are not included.Note: Light shooting 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.