2x Shark Navigator Lift-Away NV350, NV351, NV352, NV355, NV356, NV356E, NV357 Pre-Filter Kits ( 2 Foam + 2 Felt Filters) + 1 Hepa Filter Replaces Shark Part # XFF350 & # XHF350 - Fits for Shark Navigator Lift-Away Models: NV350, NV351, NV352, NV355, NV356, NV356E, NV357 - 2 Washable Foam and Felt Pre-Filter Replacement Kits & 1 Hepa Filter - Designed & Engineered By Envirocare Technologies #F650 & #F651 - Absolutely Essential for Allergy Sufferers! Traps 99.97 of airborne particles - Replaces: Shark Euro-Pro Part Number XFF350 & XHF350