The Tool Klean Grizzly Dryer Frame & Filter Kit is recommended to protect the Grizzly cage dryer from pet hair, dust, and dirt that can build up and prevent optimal function. The filter frame spring clips hold it firmly in place and easily snap onto both sides of the dryer (no tools required). The strong metal ring makes it simple and easy to remove. The foam filters are easily removed from the frame and can be cleaned of hair, washed, and air dried for better performance. Optional replacement foam filters are available when filters are worn or torn.