HQRP Pre-Motor Filter Set 4-Pack (4 Felt + 4 Foam) for Shark XFF350 NV350 NV350W NV350WC NV351 NV352 NV355 NV356 NV356E NV357 Navigator Lift-Away Upright Vac Vacuum Cleaner Coaster HQRP&reg; Pre-Motor Filter Set 4-Pack (4 Felt + 4 Foam) Replacement plus HQRP&reg; Coaster; Washable and Reusable; 100% Compatible with Original filter; 2 weeks DOA replacement warranty!