Package of 2 Cassette filters and 2 Secondary Filters to fit Eureka WhirlWind uprights. One is used on the back of the cyclonic chamber and one fits below the cyclonic chamber. Each should be changed every three months and brushed off more frequently. The cassette filter is all white and measures 8" x 6" x 0.25". The secondary filter is yellow with one stiff white side and measures 7.5" x 1.9" x 0.2". The secondary filter also fits Eureka Victory series vacuums that use paper bags. For similar products see our list of Eureka Vacuum Supplies.