HQRP Post-Motor Filter 4-Pack for Bissell Velocity Bagged Rewind 3863 38632 6221 Zoinks Pet Hair 44M3P Vac Vacuum Cleaner Coaster HQRP&reg; Four H11 Filters plus HQRP&reg; Coaster; This filter is H11 filtration class and retains 95% of particles down to 0.3 micron; 100% Compatible with Original filter; 2 weeks DOA replacement warranty!