The ResMed Mirage Quattro Cushion is the replacement cushion and clip for the Mirage Quattro Full Face CPAP Mask and comes as a single mask cushion in your chosen size. It is only the replacement cushion and clip for the Complete ResMed Mirage Quattro Mask System, a full face mask, covering mouth and nose, with a silicone cushion. It sports Spring Air cushion technology, designed to accommodate a range of movement during sleep.