HQRP Circular Filter Set 4-Pack for Bissell Rewind SmartClean 58F83, 18M9, 18M9P, 18M9V, 26T55, 58F8, 58F8R, 58F8T Vac Vacuum Cleaner Coaster HQRP&reg; Four Filters plus HQRP&reg; Coaster; This PP compound filter is H12 filtration class and retains 99.97% of particles down to 0.3 micron; Dimensions: up diameter: 3.73"; down diameter: 3.37"; height: 2.62" Compatible with Original filter; 2 weeks DOA replacement warranty!