bought wrong brand, never open or used. this listing is for 2 filters. PROTECT YOUR INVESTMENT: This filter is exclusively designed for the Levoit Core 300 True HEPA Air Purifier to maintain its peak performance. Search for Core 300-RF for genuine Levoit replacement filters to ensure what you buy is worthy of your investment CORE 300 REPLACEMENT FILTER: Exclusively designed for Levoit Core 300 air purifier to maintain its peak performance. With cost-effective price to save much cost for your all-year-round air cleaning need. It is recommended to replace filters every 6-8 months H13 TRUE HEPA TECHNOLOGY: The H13 True HEPA filter effectively captures at least 99.97% of airborne particles 0.3 microns in size TRAPS LARGE PARTICLE: Ultra-fine Nylon Pre-Filter captures large particles such as dust, lint, fibers, hair, and pet fur, also helps to maximize the filter’s life BUY WITH CONFIDENCE: Filters are sealed to protect their service time. Remove the plastic packaging of the new filters before running the air purifier