Home Revolution Replacement 1 Foam & 1 Felt Filter Kit, Fits Shark NV400 Upright Vacuums and Part XFF400 Designed to fit: Shark NV400 upright vacuum models, compare to Shark part # XFF400 Replace with confidence: We back all of our products with a 100% satisfaction guarantee Breathe easy: Washable, reusable foam & felt system removes allergens, impurities, and odors from the air and refreshes your home The Home Revolution Mantra: High-quality replacement products at a low price What you get: 1 foam + 1 felt filters