Nudura's block system is shipped flat to the jobsite. The plastic ties are permanently mounted to the foam walls, so workers can quickly fold them open. The blocks click and lock together as walls are formed. There are built-in cradles to secure and position horizontal rebar as specified. The forms are also reversible, having no top or bottom, and corner pieces can be flipped to make either left or right corners. Corners of different lengths make it possible to stagger the blocks. There are small indents in the foam to mark the locations for drywall attachment.