What are tectum panels made of?

Could you elaborate on the composition of tectum panels? I'm curious to know the specific materials that are utilized in their construction. Are they primarily composed of metal, plastic, or perhaps a composite material? I'm also interested in knowing if these materials are environmentally friendly or if there are any sustainability considerations taken into account during the manufacturing process. Additionally, how do the materials contribute to the overall strength, durability, and functionality of the tectum panels? Your insights would be greatly appreciated.