Az4002 Filter Compatible With Shark Detect Pro Max Upright Vacuum Az4000 Az4002 Az4000C --2 Pack Hepa Filters+ 4 Pack Foam Felt Filters. | | Washable And Reusable To Save Your Wallet And Protect Our Earth. | | Simple Installation, No Tools Required. Simply Remove And Replace From Your Machine Unit When Needed. | | To Improve The Vacuum Suction, It'S Better To Replace It Every 3-6 Months Or Depends On Your Usage. | | Package Includes 2 Pack H Filter, 4 Pack Foam Filter And 4 Pack Ultra-Thick Felt Filter. | |