Quantity:1 batteries required:No Item Weight:38 g Specification: Conditon: 100% Brand New Item Type: Biochemical Filter Sponge Material: Cotton Color: BlackOuter Diameter: Approx. 4.9cm/1.9in Hole Diameter: Approx. 2cm/0.8in Length: Approx. 9cm/3.5in Usage: Fit for aquarium filter Package List: 10 x Biochemical Filter Sponge aquarium sponge.Improve efficiencyThe filter cotton can prevent weeds from entering the filter and reducing the filtering effect. fish tank filter.Keep cleanIt can clean the inlet pipe of the filter, reduce the deposition of sewage, and reduce the attenuation of the flow of the filter. sponge filter aquarium.Filter sleeveThe filter sponge can be attached to the filter to effectively prevent the inhalation of shrimp and small fish, and extend the use time of the filter materials. High qualityThe material is thick, delicate, durable and very suitable for using in fresh water and marine water. Good filtering effectLightweight, soft design and excellent water permeability, dense pores make it effectively avoid residue. See more product details aquarium sponge.Improve efficiencyThe filter cotton can prevent weeds from entering the filter and reducing the filtering effect. fish tank filter.Keep cleanIt can clean the inlet pipe of the filter, reduce the deposition of sewage, and reduce the attenuation of the flow of the filter. sponge filter aquarium.Filter sleeveThe filter sponge can be attached to the filter to effectively prevent the inhalation of shrimp and small fish, and extend the use time of the filter materials. High qualityThe material is thick, delicate, durable and very suitable for using in fresh water and marine water. Good filtering effectLightweight, soft design and excellent water permeability, dense pores make it effectively avoid residue.