2 Pack Smartide Kit for Shark Xff350 Nv350 Foam and Felt, Fitting Navigator Lift-away Models Nv351, Nv352, Nv355, Nv356, Nv357 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 Kit includes 2 foam and 2 filter