2-Pack - Kit for Shark Compatible Navigator Lift-away Nv350 Nv351, Nv352, Nv355, Nv356, Nv357 Pre-filter Foam and Felt + 1 Hepa Filter for Shark Part # XFF350 & XHF350 2 Washable Foam and Felt Pre-Filter Replacement Kits & 1 Hepa Filter 100% Compatible with Original machine Absolutely Essential for Allergy Sufferers Fits Shark Navigator Lift Away Models NV350, NV351, NV352, NV355, NV356, NV356E, NV357, NV358, NV370, NV391, UV440, UV490CCO, UV540 Replaces Part # XHF350 & XFF350