Titan2 Type UL LFMC is manufactured with a spiral wound strip of heavy-gauge, corrosion-resistant, hot-dipped galvanized steel. For 3/8 in through 1-1/4 in trade sizes, the core is constructed with a square locked steel strip with an integral copper bonding strip enclosed within the steel convolutions. For 1-1/2 in through 4 in trade sizes, the core is constructed with a fully interlocked steel strip. A rugged, flame-retardant, flexible PVC jacket is extruded over the steel core. The gray jacket resists oils, mild acids and exposure to sunlight.