I received these umbrellas and decided to test them to see if there are any weaknesses in the material that could create hot spots on my items. As expected there were none and the screens worked as advertised. Some reviewers wrote that the umbrellas aren't as strong and will break if they tip over on the stand. I suppose it could have happened, but it's a function of an inadequate viewpoint. I have found the umbrella construction to be better than some other inexpensive umbrellas I have purchased in the past. I would rate this as a good buy. Oh, and one more note: umbrellas are white and don't shed color on my subjects. Nikon d3, SB900
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