Techypro&reg; Xff350 Foam Filter for Shark Navigator Lift-away Nv350, Nv351, Nv352, Nv355, Nv356, Nv356e, Nv357 Washable Pre-filter Kit (Containing 1 Foam and 1 Felt Filter) Fits Shark Navigator Lift-Away NV350, NV351, NV352, NV355, NV356, NV356E, NV357 models Compatible for Shark vacuum cleaner100% Compatibility Guaranteen. Made of high-strength and environmental protection material New replenishment Foam & Felt Filter kit for Shark Vacuum Cleaner Containing 1 Foam and 1 Felt Filter