Cardinal 42" 5' x 12' Radius ZAM Steel Panel has the strength and durability to provide preventative measures against corrosion, termites/insects, and other destructive forces. This steel panels boasts 10 to 20 times more strength than hot dip zinc coated sheets while still remaining cost efficient. The corrosion free resistance is maintained by offering five different types of chromium free treatments so you never have to worry about leaks or pinholes.