Check the listing for details. Tetra Whisper Junior / Medium Power Filter Replacement Cartridges Fits 10,10i,E. Condition: New. Listed at 12.99 USD. DescriptionOur YFS Brand replacement cartridges come pre-assembled, filled and ready to be used and will out perform the OEM cartridges provided with the filters!These replacement cartridges are constructed with blue polyester on both sides and contain extra amounts of professional grade carbon. Our carbon has been air-vacuumed, which results in a lighter more absorbent filter cartridge.Fits Models:Whisper Power Filters EWhisper Power Filters JWhisper Power Filters 10Whisper Power Filters MiniWhisper Power Filters 10iBenefitsMade right here in the USA using high quality materials.Pre-assembled and filled with high grade carbon for quick and easy cartridge replacement.Thick polyester padding for superior performance.In stock and ready to ship right to your door.