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They are as good as you can expect for the price. The non-skid is not, non skid. I had to place a non-skid mat underneath to keep the books from landing on the floor. I will eventually take the time to cut and glue those onto the bookends. They are what they are. Extremely cheap bookends, that will most likely be useful for many.
They have some parts that stick out a little more than I’d like. I usually stick these kind of bookends in the book so they’re more hidden but the extra ridges don’t allow that. They work as book ends. They’re too short for picture books but work fine for paperbacks & hardbacks.