This round tube filter screen is designed with a high-efficiency composite activated carbon layer, effectively removing smoke, dust, and odors from the Its PVC construction ensures longterm performance, making it an ideal option for maintaining clean and fresh air in ventilation systems and air purifiers. Features -Color:Black -Material:Activated carbon, sponge -Size:17.50X17.50X3.00cm/6.88X6.88X1.18in -High efficiency filtration: designed with a composite filter, this round tube filter effectively removes .5 particles, improving indoor air quality for a healthier living environment -Activated : the activated carbon material absorbs smoke, dust, and odors, creating a fresh and clean atmosphere in your home or office -Optimized airflow design: the round structure ensures even air distribution, maximizing purification efficiency and making it suitable for various ventilation systems -Ideal for challenging environments: suitable for kitchens, smoking areas, and other spaces prone to pollutants, ensuring your family breathes cleaner air -Easy maintenance: simple to install and replace, this filter ensures consistent performance with minimal effort, making it ideal for homes, offices, and more Package list: 4 x Air Purifier Replacement Filter