Reliable material: the nebulizer filters are made of nice material, which is safe odorless and non-toxic, suitable for daily and long-term use Proper size: the round nebulizer replacement filters are approx. 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: we offer you enough quantity, suggest to replace in a regular basis to maintain the performance and extend the life span of your machines, they are easy to replace, which just takes several minutes Nice performance: the white replacement nebulizer air filter sponge can be compatible with most standard compressors and cool mist devices, filtering the air and making it fresher and cleaner, which can bring healthier life for you and your families Package included: you will get 48 pieces of round replacement air filter sponge, enough quantity for your daily use and replacement and you can also share with other people who need them