Good stuff, fairly thick but easily fits under a grill cover for a case fan, which is what I'm using it for.  Only problem I had was that it showed up bent, not the manufacturer's fault.  It's thicker than most perf aluminum that you see, heavier duty, very easy to shape.  I domed it a little (made it convex) with a ball peen hammer, finished the circular edge with a piece of circular silver solder...viola, custom fan grate, any size I choose.