... 1.Material: Alloy steel,excellent quality 2.Weight: light 3.Not rusting, resistant to impact 4.In stock Polymer alloy steel Engine steel ... moisture, rust etc.3)Energy saving - the protection board light weight is a metal protective board of the 1/4weight, ... .3. Material: Polymer alloy steel , resistance to impact,no rust, not affected by damp.4.Installation: Light weight, easy to install, ...