Dimension: Approx. 8*4cm/3.15 x 1.57inch cylinder, the inside hole diameter is 2cm/0.79 inch, please note these foam are pre-filter sponges, so only have single hole.
These sponges are made from the top-quality filtration foam, safe to your fish, no harm to water PH quality, good for freshwater and saltwater environments.
These pre-filter sponges could help to trap particles and debris, and prolong the life of your filter media, provide efficient water flow with less clogging for long lasting filtration.
These cylinder pre-filter sponge suit for all shrimp tank owners and anyone else who has baby or small fish in their tank,provide them a safe environment.
These sponge covers slip easily over the intake tube and prevent any of the fish from it.
