1.A must have filter accessories for your fish tank,these pre sponges are made from the top-quality filtration foam, safe to your fish,suit for freshwater and saltwater.
2.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,enhance filtration.
3.Give your fish pet a securaty habitate! these pre-filter sponge suit for all shrimp tank owners and anyone else who has small fish in their tank.
4.Sponge size：approx. 8.5x5cm/3.4x2 inch cylinder.
5.Inside hole diamenter: approx. 2.1cm/0.8 inches
6.Package included: 4 pcs pre-filter sponges,black.
7.Please note: these foam are pre filter sponges,so only have single hole,suit for fish tank/aquariums pre filter systems.