Description Fish Tank Pre- Filter Sponge Roll Cartridge Replacement Filters for Aquarium Features- Color: Black;- Material: Cotton;- Size: 8 x 4 x 2. 2cm;- Size: 8 x 4 x 4cm;- Premium quality sponge connects to filter debris from entering the filter barrel; extending filter media usage time;- fish and shrimp from being sucked into the filter tank;- Provides efficient water flow with less clogging for filtration;- Easy to use directly into the water inlet; Good for freshwater and marine environments; Package Including 6 x Pre- Filter Sponges