uxcell Sponge Aquarium Fish Tank Double Biochemical Air Pump Filtration Filter Black Product Name : Sponge Filter;Model : IF-734;Package Content : 1 x Sponge Filter2 x Suction Cup Fit for : Aquarium below 58L;Material : Plastic, Sponge;Net Weight : 144g Sponge Size : 12 x 6cm/ 4.7" x 2.4"(H*D);Overall Size : 23 x18cm/ 9.1" x 7.1"(H*W) Tube Hole Diameter : 2cm/ 0.8";Main Color : Black Sponge filters provide both mechanical and biological filtration.