Instead of cloth, they are made out of 1/4" plywood from Home Depot.
Everyone enjoys a personalized patch!
Step 1: The the Wood to a Uniform Size
You need two corel files -- one with the front, and the second with the art for the back. All you need to do is to make sure that the art is centered within the square.
When you turn it over, you can engrave the back and it will match perfectly with the front.
The last thing to do is to make the cut line for the shape.
Step 2: Engrave the Backs and Finish With Spray Lacquer
Run the engraving for the back and also do the cut for the arrow shape.
All that's left to do is to finish with a couple of coats of spray lacquer on each side.
I made it at Tech Shop