Unfold and straighten the hangers. Using the pliers, fold down the top 2 inches of each straight wire, forming a hook. Push the 2 hangers down through the plastic on either side of the mouth so they come out of the bottom and can be stuck into the ground. Secure the hangers on the back side with the green electrical tape. Tips You can also use regular cardboard and paint it if you can't get corrugated plastic, but it won't be as durable.
Corrugated plastic is made by several manufacturers.
It is known as Stratocore or Coreplast, along with other names. I found that if I purchased it from a signage store it was cheaper as long as I was going to make several projects out of it. Otherwise, open it.