These are star shapes to be used with the 'Stars and Stripes' prop created by Charlees Props.
There are 2 shapes available:
Also included are 2 alignment guides to make centering the star easier. One is used when you've already pushed your pixels and gives you a center hole to stick a small screwdriver/awl through. The other is used if you haven't yet pushed your pixels and has a point to create the hole for you.
The stars have a center prong that fits into the hole created with the guide/punch. I found that it was helpful to use a small awl to slightly widen the center hole just before seating the star, then push the center of the star to engage the prong into the center hole. The coro will bounce back slightly, which should hold the star relatively tightly. You could also put a drop of super glue in the hole just before seating the star, but I didn't go that far (yet 🤞).
You can see how effects look on both types of stars in the video below:
And here's a video with 50 full caps installed: