HQRP KIT: HEPA Filter + Foam & Felt Filters for Shark Navigator Lift-Away NV355, NV351, NV356 Series Upright Plus Coaster HQRP&reg; Kit: 1 HEPA Filter + 1 Foam & 1 Felt Filters plus HQRP&reg; Coaster; This HEPA filter is H13 filtration class and retains 99.95% of particles down to 0.3 micron; Foam & Felt filters are located exactly below the dust cup and protect the motor from any debris going into it; Compatible with Original filter; 2 weeks DOA replacement warranty!