COMPATIBILITY: These gel nasal pillows are designed for use with all Nuance & Nuance Pro CPAP and BiPAP Masks.
SIZING: Three gel nasal pillow sizes -- Small, Medium & Large -- are available. Any pillow size will fit on any Nuance or Nuance Pro mask so if you find you want to try a different size you can simply purchase a new nasal pillows cushion rather than having to buy a whole new mask.