Safe and Durable - The aquarium filter bags are made of soft and safe material, with double stitch construction, the fibers will not fall off and the fish will not be hurt. Filtering 2 in 1 - The drawstring cleaning bags can be used as filter bags or filter felt, the size of aquarium filter bags is 17x7cm, so just clip it into the water pipe outlet or lay it flat in the filter box. Reusable - The bags are very easy to clean, hand wash or machine wash is available, it can last for a long time. Convenient filter accessories - Adopting the theory of ecological wetland filtering, the filter socks help remove suspended solids and absorb particles by filtering to provide a clean and healthy environment for fish to live. Net Kit aquarium cleaner - Package includes 4pcs replacement of filter bags, suitable for aquarium, fish tank, chemical industry, etc.