The High Flow Nasal Cannula has curved prongs that fit the nostrils naturally for a comfortable fit. The nasal cannula eliminates the need of wearing an oxygen mask, but it still delivers the high flow rate of oxygen that is required. This nasal cannula can be comfortably worn to get between 6-15 LPMs (liters per minute). Use the High Flow Nasal Cannula with the Millennium M10 concentrator for best results.