The Foldable Top Shelf is available in either expanded metal or plasma cut 3/16" mild steel. The mild steel version is thicker and maintains heat differently so cook times may vary. Disclaimer: Edges may be sharp. Product is built out of mild steel and should be washed and cleaned and properly burnt in for use. Weight capacity may vary depending on size and material used for your custom grates/shelves. Shelves are built to order and currently 4-5 weeks build time.