I have several shelves filled with 8-12 heavy binders at my workplace, and nothing seemed to keep them from falling over, but these bookends have done the trick!!! I was concerned they wouldn't be large or heavy-duty enough for the job, but they're plenty tall to keep the binder upright, the non-skid padding keeps them from slipping pretty well, and even when I remove something and the binders fall over, the bookends don't fall or move. I'm extremely pleased with this purchase, not to mention I received the produch the next day with the free shipping for purchases over $75! AWESOME!!!