Maytronics 9991425-r4 Dolphin Nautilus Robotic Pool Cleaner Filter Cartridge Wave 75, Edge - 9996359, Nautilus - 99996323, Nautilus - 99996323-WT, Triton - 99996356, Quest - 99996329, Premier - 99996339, Prowler 820 - 99996326, Prowler 830 - 99996346, Deluxe 4, Deluxe 5, DX5s, DX6, Discovery 99996349 Rectangular measurement of black frame (not including the locking tabs) 5 - 2/16" x 10 - 14/16" These are the Accordion style filters Best for use with smaller debris like sand, silt and algae Please make sure your pool cleaner is on the list above. If it is not, this will not fit and you are responsible for return shipping. These do NOT fit the Nautilus PLUS or Triton PLUS cleaners.