WEAVERBIRD 4PCS Pre-Filter Foam Sponge Roll Aquarium Filter

Dimension: Approx. 8.0cm*4.0cm/3.15 x 1.57inch cylinder, the inside hole diameter is 2.0cm/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 inhabitants from being drawn into the filter. Good 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 good environment. High quality material: These sponges are made from the top-quality filtration foam, BPA free,good for freshwater and saltwater environments.