Features:<br />- Biochemical filter cotton｣ｬ good ventilation flow resistance small effective filter impurities<br />- Drainability strong not easy to jam filter performance is good<br />- Can be repeated washing ｣ｬis not easy to deformation<br />- Strong pressure resistance and free cutting<br />- Small soft filter cotton mill hole clearance degree is high Suitable for cultivation of nitrifying bacteria<br />- Effective change water for your pet to provide a comfortable and balance of the aquatic environment<br />-Three sizes are optional<br /><br />Specifications:<br />-Material: Acrylic<br />-Color: Black<br />-Size: 3 sizes fit to our filters for BKL-NZ01｣ｬ BKL-NZ02｣ｬ BKL-NZ03｣ｬ <br />          or you can buy for yours according to below Dimension(L&amp;W&amp;H):<br />  BKL-NZ01: 8 X 4 X 3.5 cm<br />  BKL-NZ02: 8 X 4 X 4.5 cm<br />  BKL-NZ03: 10 X 4.5 X5.5 cm<br /><br />Package Includes:<br />1X Filter sponge<br /><br />Note:Please complete our filters to select your desired filter cotton<br />        When cleaning be careful not to be too vigorously against denitrifying bacteria culture