Weld Spatter and Static Resistant Tubing: 3 layers: inside is PU, middle layer is an aluminum foil, outside is anti-flaming jacket. An aluminum foil is added between the outer layer and the inner tube to increase the flame retardant life. Compared with the 2 layers weld spatter tubing series, the flame retardant life is extended by 2 times longer. Can be used in sparking environments such as arc welding and electric welding.