These are Colored Back Badge Holders!
They have a solid colored back and a clear cover on the front to display your ID—only on one side. Slip it in from the top, and there you go.
Easily attach a vinyl strap or other attachment to display your badge on a lanyard or badge reel.
Or if you prefer, attach a chain using the two smaller holes.
These badge holders really make you badge stand out more, especially with the brighter colors—but they also keep them secure.
Lastly, they are very flexible and light weight.