Description: Made of high quality cotton sponge and plastic, durable to use and easy to replace, suitable for all types of water. As the water passes through the pores, the sponge will trap debris from your tank, leaving the water crystal clear. Effectively improve water quality. Cultivating the nitrifying bacteria, will give you superior biological filtration in your tank. This filter is noiseless and energy saving. These create numerous minute bubbles for increased oxygen flow. Betta, fry and other small fish will never get sucked up into the filter. Fish friendly, you can feel relieved to use it. Aquarium inter filter can be used for many times, easy to clean. Specification: Material: Plastic Size 1(DxH): Approx.5.5x10.5cm/2.17x4.13inch Size 2(DxH): Approx.8x14.5cm/3.15x5.71inch Size 3(DxH): Approx.11x14.5cm/4.33x5.71inch Package Includes: 2 Piece Aquarium Filter 2 Piece Hose Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color of the pictures and the actual item.