Fits All M-Series?? PR System ONE and SleepEasy CPAP/BiPap</br>Exceeds Industry Standards</br>Sunset Medical - Industry Leader in Medical Filtration</br>Dimensions: 1 3/4"x 7/8"</br>12 pack Ultrafine Filters w/o tab</br></br>Product Description</br></br>Ultra Fine CPAP Filters- Philips Respironics M-Series?? System One 50 or 60 Series PR System ONE CPAP and BiPAP machines. CPAP Filters! Compatible with all M-Series?? 50 Series & 60 Series CPAP and BiPAP platforms. CF-1063096-12 Respironics UltraFine Very High Efficient Filter - Industry Leader in Medical Grade Filters - Sunset Medical Filtration. Proven Quality that exceeds OEM! Made in USA</br><br/>http://www.amazon.com/gp/product/B013CXEDR2