Replacement filter for  WindTunnel Self-Propelled uprights andWindTunnel Bagless uprights with the Allergen Filtration Systemincluding 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 perpack. Measures 10 7/16" x 3 5/16" x 1/2". This is NOT a genuine Hooverfilter, this is a Generic replacement for part # 38766021.