Looks like stone coated metal. 1st time I inspected one was about 4-6 yrs ago in mid summer. About 90 degrees outside.From the ground and the dark brown color of the one I was looking at … I thought it was shakes. I climbed my ladder … got to the top and with both feet on the ladder AND keeping one hand on my ladder, I placed my other hand on the surface of the roofing to mount it … BIG mistake
The word that comes to mind is OWEEEEEEEEEEEE