The product is built on pipelines buried underground, like water pipes and gas pipes, serving as a security blanket to warn potential damages. This product is the difference between the previous products by specialized machinery and equipment to PE pad folded and welded into a 2-fold or 3.5 times the length. The so-called two-fold means the 50-meter warning pad folded into a roll after straightening the total a length of 100 meters. Since it has good tensile strength and toughness, in the excavator digging process, it will not get easily cracked by excavator, so that it plays a role of warning and protection to underground pipes from excavator damage. Meanwhile, it is also chemical resistant for a longer-time usage.