The ResMed Seal Ring, 10 pack, is designed for the ResMed Mirage Swift Nasal Pillows nasal mask system. The seal rings attach to the headgear and then attach to each side of the Mirage Swift frame. On one side of the frame, the seal ring is joined with the Mirage Swift cap to prevent airflow from coming out of the mask frame. On the other side of the Mirage Swift frame, the seal ring is joined with the Mirage Swift Short Tube which leads to standard CPAP tubing.