This is the original replacement headgear for the Mirage Quattro FX Full Face mask This headgear will not work with the Original Mirage Quattro Full FaceThis is the headgear only and does not include the headgear clips, which can be ordered here. Medium Size Headgear is the standard size that is most commonly used. #61733 (Medium- Standard Size Headgear) #61734 (Small Size Headgear (#61733) #61738 (Large Size Headgear (#61733) ©ResMed 2010 Used with Permission to all WebPages with ResMed picturesRESMED Minimum Internet Retail Price & POLICIES FOR THIS PRODUCT - We are only authorized to sell and ship Resmed products to end-users residing in the United States. A prescription is required for the purchase of certain products on this site including masks, humidifiers, and machines. Prescriptions can be emailed to firstname.lastname@example.org or faxed to 856-767-7151. All services are provided solely by The CPAP Shop and independently of the manufacturer. These services include the advertisement, ordering, sale, delivery, instruction, and setup of the products.