Panasonic HEPA media filter MC-V199H (MCV199H).
This hepa filter is approximately 4 inches by 6 inches in size.
The black gasket should be facing the vacuum during installation.
Designed to fit a number of Panasonic upright vacuums, including but not limited to Panasonic models:
Universal replacement HEPA filter for Panasonic. Replaces Panasonic filter AC38KCNPZ000. Equivalent to Kenmore filter 86889 EF-1.