●Premium Glass Construction: Crafted from high-boron silicon glass for durability and long-lasting use. ●Dimensions: 8mm diameter, 1.8mm thickness ●Optimal Airflow Design: Each filter features 7 small holes, ensuring efficient air circulation while preventing debris from entering. ●Easy-to-Clean Honeycomb Filters: Cleaning is a breeze, simply rinse and air dry the honeycomb filters for a quick and effective refresh. ●Versatile Glass Filtering: Ideal for laboratory, these glass filters provide a superior filtration experience. Includes 20 pieces for extended use.