ResMed 16333 Small Mirage Micro Nasal Mask. A flexible, form-shaped device designed to be placed over a user's nose to interface with a continuous positive airway pressure (CPAP) or bi-level positive airway pressure (BPAP) unit to provide the respiratory tract with direct ambient air, or medical oxygen (O2) and air, at a higher pressure than ambient air for noninvasive positive pressure ventilation (NPPV). It is typically made of plastic and/or silicone materials, creating an airtight seal around the nose. It is available in various designs and sizes and is stabilized with a head strap. This is a reusable device.