WEAVERBIRD 4PCS Pre Filter Foam Sponge Roll Aquarium Intake Cover for Fish Tank, Large

Dimension: Approx. 8.0cm*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. Enhance biological filtration: 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. A must have accessories for fish tank filter: Premium pre-filter foam sponges can be quickly and easily attached to the fish tank intake tube stem, preventing small or weaker inhabitants from being drawn into the filter. A security for your fish habitat: Give your fish pet a security habitat! 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. High quality material: These sponges are made from the top-quality filtration foam, BPA free and safe to your fish,no harm to water PH quality, good for freshwater and saltwater environments.