New in Sealed Packaging. This Dual-Wall Spring Air Cushion is designed for use with all Mirage FX & Mirage FX For Her CPAP & BiPAP Masks. Each Dual-Wall Spring Air Cushion is coated with soft-touch frosting to provide comfort and even pressure distribution. The unique design provides an even softer texture and removed undercushion at the nasal bridge to reduce the pressure, soreness, irritation and discomfort commonly felt in this senstitive area. ResMed - Part 62111-Standard