Pre Filter Black Sponge Foam Protector For Aquarium Cylinder Pre Filter Feature The premium quality pre-filter foam sponge is quickly and easily attach to the intake tube stem,preventing small,baby or weaker inhabitants from being drawn into the filter. This is a must have for all shrimp tank owners and anyone else who has baby or small fish in their tank. Installs in seconds and lasts for months or even a year,depending on contents and load factor of your tank. Aids in biological filtration.Traps debris and prolongs the life of your filter media.With single port. Suitable for all kinds of waterfall filters and small cylinder filters. Specifications * Color: Black * Material: Filter Sponge * Size: 55 mm(L) x 34 mm(Dia.) * Inner diameter: 15mm Package include 1 x filter foam sponge