The filter set is designed for NV650 NV750 series, including NV650, NV650W, NV651, NV651, NV652, NV750, NV750W, NV751, NNV752. NV752BRN, NV765, NV831, NV835, AX950, AX951, AX952. Replacement parts # XFF650 and XHF650. Premium quality filters improve the cleaning performance and powerful suction of your vacuum cleaner. Without noise and clogging, feel the difference in your upgrade vacuum cleaner and enjoy easier cleaning. Perfect replacement. So now can change while waiting for the other filter to dry after cleaning. Washable and reusable. It is recommended to replace the felt filter and foam every 3 months, the HEPA filter every 6 months, to keep your vacuum cleaner at its best performance, depending on usage. Compatible Model: NV650 / NV650W Rotator Lift-Away Upright Vacuum. NV651 Rotator Deluxe Lift-Away Upright Vacuum. NV750W / NV751 Rotator Angle Lift-Away Upright Vacuum. NV752 Rotator TruePet Lever Lift-Away Vacuum. NV831 / NV835 DuoClean Lever Lift-Away Vacuum. NV651Q /