Finest-Filters high quality compatible replacement filter media, offers a greater saving, than purchasing origional brand media. Please see the bullet points above to the filter model these pads fit.
Finest-Filters compatible replacement foam filter pads are made from the same material as the Fluval origionals.
These filter pads are cut to fit the Fluval U4 range of internal filters
The pads measure 235 x 62 x 16mm
These sponges contain the boilogical cultures, biologically and mechanically filtering the aquarium water
This is not a Fluval Product. This is a Finest-Filters alternative which serves the same purpose as the origional brand.