<ul><li>1 3/4long x 1wide x 3/8high</li><li>CompatibleCPAP air filters for any of your CPAP Machines from Philips Respironics M Series, PR System One Series and SleepEasy Machine.</li><li>Safe MaterialSterile sponge that does not fade & does not slag provides a better experience.</li><li>Simple operationAll we have to do is open the filter cotton port of the Philips ventilator and replace the filter that is no longer able to filter properly.</li><li>Customer serviceIf you have any questions, please feel free to contact us.</li></ul><br><br>Compatible: CPAP air filters for any of your CPAP Machines from Philips Respironics M Series, PR System One Series and SleepEasy Machine.

28-Pack Reusable CPAP Foam Filters - CPAP Filters Compatible with Philips Respironics M Series, PR System One and SleepEasy Series