The assembly kit only includes one full face cushion in the choice of sizes small, medium, large, small (for her) and medium (for her). The assembly kit does NOT include the headgear. InfinitySeal Full Face Cushion The seal is designed to contour unique facial structures and for various pressures whilst providing a strong seal and providing the best apnea therapy throughout the night without the worry of leaks. Quick Release Elbow and Diffused Venting The quick release elbow on the AirFit F20 mask can be removed from the tubing without having to remove the mask fully. If you need to get up during the night this means you don't have to worry about taking the mask off and re adjusting it when putting it back on, allowing you to make a quick reconnect to the tubing without disrupting your rest. Mask tubing should be every 3 months and headgear every 6 months.