Description:Good MaterialThe filter cartridges are made from filter cotton, plastic and activated carbon, which can provide lasting filtration performance and keep the water clean and fresh for fish.High AdsorptionThe filter cartridges can greatly capture fine particles or dust in the water and remove odors, water discoloration or impurities that may harm the fish tank or the fish.Effective CleaningThe activated carbon material inside the filter cartridges can better absorb odors, water discoloration and impurities in the fish tank so that your fish can have a better habitation environment.Size InformationOur filter cartridges measure about 9 x 7cm/3.54 x 2.76 inches in length and width. You can check if they fit your fish tank in advance.Helpful GiftYou can send these filter cartridges to them if your family or friends are keeping fish or other aquatic pets. The helpful accessories will help them with cleaning work more efficiently.Specification:Material: filter cotton + plastic + activated carbonColor: white + cyanFeature: durableSize(approx.): (L x W) 9 x 7cm/3.54 x 2.76inchPackage Included:12 Pcs x Filter CartridgesNote:1. Due to the light and screen difference, the item039;s color may be slightly different from the pictures.2. Please allow 1-2 cm differences due to manual measurement.