[High quality material] Made of high quality stainless steel, compact structure, not easy to deform, healthy and environmentally friendly, strong and durable. [Function] The aquarium filter is small, easy to install and easy to use, and prevents shrimp or fish from being sucked into the cartridge filter. [Easy to clean]Simply use your hand or a soft brush such as a toothbrush to brush the accumulated dirt on the filter cover, and the accumulated residue disappears in seconds. Package content: 2 aquarium filters, inner diameter: 12 mm, outer diameter: 25 mm, length: 68 mm. [Multi-function] Avoid inhalation, small fish like freshwater shrimp, invertebrates, small fish and young fish, suitable for tropical fish, koi ponds, water systems used, the cooling towers and other commercial and industrial systems.