If you are using Velcro to mount a Vive Deluxe Audio Strap to your Oculus Quest headset, you can use these rings to fill in the hole a bit and give the Velcro SOMETHING to hold on to besides the narrow edge of the plastic.

You do not have to glue these in, they just press fit in and give more flat surface area for the Velcro to grab and help resist twisting. Make sure to orient the flats correctly.

I used .25mm layer, 3 layer top/bottoms, 3 perimeters.