Our pergolas have treated mild steel inserts for long spans. Specialized anti-corrosive hardware and fittings make for easy and quick installation or dismantling.
Currently we have 2 sizes- 50mm x 100mm and 75mm x 75mm. However we are working on a few more sizes to enhance the choice to the consumer. We should have 100mm x 100mm up and running at the beginning of 2018.