The Perfect Fit: This 24 pack of CPAP Filters are only with compatible with the ResMed Air Mini CPAP machine for travel. They have been specifically designed to fit perfectly, so you do not have to trim them to size. Excellent Airflow: Made from an ultrathin material, these CPAP filters don't impede airflow unlike other CPAP accessories on the market. They are not too dense, and they don't give any resistance to the air flow. Extra Value Pack: This super value 24 pack provides a necessity at an affordable price. Why pay more through insurance every 6 months for the same quality product? Quality Air Filters: You know the importance of using top quality products when it comes to your breathing! These air filters stop dirt and particles from entering the machine and your airways. Excellent Value: It is recommended to replace the CPAP filter every 4-6 months. The 24 pack provides excellent value for money for a must-have product.