You heard sctly. Apples to apples, steel is stronger than aluminum, that is why we extrude and cast our aluminum to give our tree fences the strength needed. As mentioned above, we worked with our structural engineering firm, Blue Sky Design, Inc. Consulting Engineers, and manufacturing partners extensively to create the cast and extrusion molds and chose the alloys to get the perfect combination of strength and function. Because you can't extrude or cast our tree guard panels and accessories, we couldn't get the strength we needed from aluminum and therefore we chose steel for these products. Click here to see our structural engineering firms (Blue Sky Design, Inc. Consulting Engineers) report on the strength of our aluminum tree guards.