Includes 2 HEPA filters and 4 foam & felt filters forming a complete vacuum filter system. Replacement parts perform as well as the originals, with a perfect fit and easy installation. High performance filtration Foam filters with 60 PPI density and ultra-thick felt filters with a textured surface enhance particle capture. HEPA filters are H12 efficiency, trapping pollen and 99.97% of particles as small as 0.3 microns. Perfect fit Compatible with Shark Navigator Zero-M Self-Cleaning Brushroll Pet Pro Upright Vacuum ZU60, ZU62, ZU62C; Shark Navigator Pet Plus Upright Vacuum NV251; Shark Rotator Pet Plus Upright Vacuum NV255. Compare to Part # 1238FT60 & 1239FT60. Regular maintenance Clean and replace filters regularly based on use. Rinse filters with water only and let all filters air-dry completely for at least 24 hours before reinstalling. Replace HEPA filters every 6 months and replace foam & felt filters every 3 months.