This item is the headgear (only) for the Opus™ 360 Nasal Pillows Mask. Mask and headgear kits, or mask only, are also available for purchase. The Opus™ 360 Nasal Pillows Mask is small, quiet and superbly comfortable, offering unprecedented freedom. The slim-line design allows for almost any sleeping position without mask displacement. Its innovative 360-degree pivoting ball-and-socket elbow provides greater versatility. With its new Silicone Pillows and facially Contoured Mask Frame for extra stability, patient comfort is paramount.