[DIMENSION]:Approx. 15cmx6.6cm/5.91inch x 2.60inch 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 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, Weight: 0.02866009406 pounds, Manufacturer: TWISAXC