This is the MicroFit dial that fits into the the forehead support. The Microfit dial can then be turned clockwise or counter clockwise to allow for 24 small incremental adjustments. The above picture shows (from left to right): MicroFit Dial • Mask Frame • Forehead Support • Forehead Pad Compatible with the following masks: Mirage Quattro Mirage Micro Mirage Softgel Mirage Activa LT ©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.