12 Sets Replacement Filter Set for Shark XFF350 Navigator Lift-Away NV350, NV352, NV355, NV356E, NV370, NV391,UV440, UV490CC0 (12 felt & 12 foam) Foam Filter Kit includes a foam filter and a felt filter for Shark vacuum model NV350, NV352, NV355, NV356E, NV370, NV391,UV440, UV490CC0 Replace part XFF350. 12 SETS- including 12 foam filters and 12 felt filters Filters made with high performance material. Washable and re-usable 100% customer satisfaction guaranteed. Quality meets or exceeds leading national brands. Not in retail packaging.