Smartide 2 Pack Kit for Shark Navigator Lift-Away Nv350 Nv351, Nv352, Nv355, Nv356, Nv357 Pre-Filter Foam and Felt + 1 Hepa Filter for Shark Part # Xff350 & # Xhf350 fit Shark Navigator Lift Away models NV350, NV351, NV352, NV355, NV356, NV356E, NV357 Made of high-strength and environmental protection material 100% Compatible with Original machine Absolutely Essential for Allergy Sufferers 2 Washable Foam and Felt Pre-Filter Replacement Kits & 1 Hepa Filter