Package of 1 genuine Panasonic HEPA Type upright primary filter. This white filter pad measures 4 5/8" x 3 1/4" x 1/4". It fits in the bag chamber under the paper bag. Keep in mind that the Panasonic uprights that use this filter do not have completely sealed systems so the stringent HEPA specification may not be met by them. These filters fit Panasonic models MC/MC-V51**, 52**, 53** and some 73**. (** denotes digits 00 to 99) For similar products see our list of current Panasonic Vacuum Supplies.