stamped sheet metal and speed nut / clip, finger on the right pointing to the clip, finger on the left pointing to the stamped sheetmetal, note the hole in the sheet metal piece lines up with the speed nut / clip
You can sort of see the particle on the right hand side of the spread apart pleat on the ridge of the upper portion, the blurry thing is zoomed in, Id call this metal and its not the only one.