Thank you for viewing my products. CPAP (Continuous Positive Airway Pressure) ResMed AirFit F20 Headgear (Replacement) Size: Standard 【Bulk Purchase Discount】 Check out my other items!! I am also selling on other platforms, so items may sell out. Priority will be given to the first person to purchase. Items may be marked as SOLD even while inquiries are ongoing. I am an individual, so my responses may be delayed, but I will always reply.