Fits Hoover Wind Tunnel upright vacuum cleaners. Fits inside the filter door of WindTunnel Self-Propelled uprights and WindTunnel Bagless uprights with the Allergen Filtration System including U57009RM, U5720950, U5720960, U5725900, U5725960, U5750906, U5750911, U5752900, U5753900, U5753950, U5753960, U5753980, U5760900, U5760910, U5768900, U5786900, U6471900, U66009RM, U6607900, U6616900, U6617960, U6618900, U6630900, U6632900, U6634900, U6637900, U6637960, UH40020, UH40065, UH40115CA, UH40125, UH60000. Includes 2 filters per pack. Measures 10 7/16" x 3 5/16" x 1/2". Originally produced with green, yellow and white layers - now comes in just white. Genuine Part - Hoover 40110006 For optimum performance and extended motor life, replace vacuum filter every 18 months.