They are plastic, but very strong and the clamping power is quite good. The only annoyance is the little red pads on the end, swivel all the way around so if you are trying to attach something up high with one hand, sometimes they flip backwards and don't grab correctly. You just need to make sure they are facing inwards before you reach up high. I used all 6 clamps to attach a large king size sheet to a linco backdrop stand and it was enough - ... full review
I just got this today and attached it to my back drop stand using A Clamps across the top. There are some crease marks where it was folded so I will try various tricks I found on the internet to get them out, hopefully, without melting or ruining it. I didn't give it 5 stars because it is a little small at 5'x7' for anything but a seated subject. That's not the sellers fault as it clearly states 5'x7' but I would definitely recommend it if it were 6'x9' or larger. Even with the folded creases, it works well out of the box.
Again, if you are starting out or having trouble I would recommend getting the light a little further back (somewhere between 4 to 8 feet if using a similar sized light source). You will also notice that the right side of my backdrop is actually not 100 percent white, it fades to a light gray shade. I could increase my fill or correct this in post-processing, but the slight shift is intentional in this image.
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