This product fits the Fly Fly F-100. It is used to protect the foam fuel tanks so you can fly your model from grass fields. They are sold in pairs . The material is .020 PETG clear plastic, the same stuff soda bottles are made with so you know how tough it is. The total weight you will be adding for this protection is only 2 ounces.
Installation is straight forward so no instructions are available. They trim with scissors and are held in place with small dabs of silicone .