Description: DIMENSION: approx. 15cmx6.6cm/5.91inchx2.60inch cylinder, please note these foam are pre filter sponges, have single hole.ENHANCE FILTRATION: These pre filter sponges could help to 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 SECURATY FOR YOUR FISH HABITATE: Give your fish pet a securaty habitate. These cylinder pre filter sponge suit for all tank owners and anyone else who has small fish in their tank,provide them a safe environment.MATERIAL: Sponges filter made from the sponge, good for freshwater and saltwater environments. Specification: Material: Sponge Length: 15cm/5.91inchDiameter: 6.6cm/2.60inch Package Includes: 1Aquarium Sponge Filter Note: Please allow slightly errors 1-2cm differences due to manual measurement.