I have several bird pens made from 6' chain link. I use both the 20' and 30' lengths to wrap around the entire pen while leaving space for the doorway and a partial side. I also secure a poly rope around the entire run about mid way to keep it secure against the wind. It has worked out beyond my expectations. These tarps are extremely durable. They have not lost any luster from exposure and I expect they will last years, which is more than I can say for any other brand of basic silver tarps I have wasted money on over the years. I highly recommend them.