This pack of 2 primary filters is designed to fit in the Hoover WindTunnel bag chamber below the paper bag. The filter measures 5" x 2 3/16" x 3/8" with a rectangle notched out of the one corner. While initially green as shown, it is now white in color. This filter has replaced the Layered WindTunnel Primary Filter #38765023. For similar products see our list of Hoover Vacuum Supplies.