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I am using these to hold all my Marvel DVD/Blu Rays together. They could more than easily hold up a heavy stack of books as they are very sturdy and well made. This was a splurge purchase for me as I was going to go with some cheap plastic bookends, but I'm so glad that I didn't. These easily surpassed my expectations. I can't imagine being happy with anything but these for my Marvel collection! It's also great that they have two different characters pictured - a lot of sets I was shopping just repeated the same character on both sides. They also shipped very quickly. Couldn't be happier.