Reliable material: The nebulizer filters are made of high-quality material, which is safe, odorless, and non-toxic, suitable for daily and long-term use Proper size: The round nebulizer replacement filters are approximately 1.5 cm (0.59 inches) in diameter and about 0.9 cm (0.35 inches) in height; please check the size carefully before ordering Replace regularly: A sufficient quantity is provided; it is recommended to replace the filters on a regular basis to maintain device performance and extend the lifespan of your equipment; these filters are easy to replace and take only a few minutes Good performance: The white replacement nebulizer air filter sponge is compatible with most standard compressors and cool mist devices, helping to filter the air and deliver cleaner, fresher airflow for improved respiratory wellness Package included: 48 round replacement air filter sponges, providing ample supply for regular use and replacements; ideal for sharing with others who may need them