Description:
Material: polyester nylon
Color: gray (or a little color difference, does not affect the use)
Size: F20

package:

1/2/3x head strap/shoulder strap suitable for ResMed F10 or F20 CPAP mask size medium/standard

As you may know, these straps stretch over time and are expensive to replace. Compared with the ResMed brand, these will help you save on parts costs

Note:-This is not a complete mask-just a strap