Brand XINYOU Model XY-2835 Quantity 1 piece(s) per pack Color Black+Write Material Cotton + Plastic Suitable Pet Fish Specification For Aquarium within 40L; Other Features Supplying the water with much needed oxygen; Reduces noise from air pump and consumes lowest wattage; Most fit to external or top filter as preregistration unit; No dead spots in cylinder foam offers increased filtration; Easy maintenance is made by nodular design of foam Cartridge system; Various types of installations are possible. Packing List 1 x Sponge Filter 1 x Plastic Tube