My wife ordered the 150mm size to make a 6 foot diameter tree ring out of. I was a little skeptical when it first showed up, a box full of 45 inch pieces? However my fears were unfounded; the product is well designed, well-made, and very easy to work with. It took me about 45 minutes to build and install a 6 foot tree ring using this material. Definitely watch the video on the website before you try to work with this as there are a couple of steps shown in the video that are not clearly explained on the directions on the box. It does arrive as raw steel and is sort of a dark gray color. My wife found a recipe online that uses hydrogen peroxide, vinegar and salt that we applied with a spray bottle and it looks perfectly rusted in one day! I like it so much that I just ordered some more!