I love these dividers. Not only is the side with punched holes reinforced the labels area itself is coated (plus! on both sides) so you can readjust a label that you place on a little crooked. Nice clean look. Different sizes to choose from (3-cut 5-cut and so on).
These binder dividers are firm enough to withstand lots of flipping back and forth but not too thick so that they take up too much room in a binder. I prefer them to those with pockets. Most of what we use them for is monthly records where extra storage pockets are not necessary. The label tabs on these dividers are of good size and can be very descriptive unlike the plastic insert tabs. Those are usually small and make descriptions difficult. I also like the fact that these tabs are unlabeled so they can be used in multiple situations.
Staples® Write-On™ BIG TAB Dividers ROCK. You can write on them if you are in a hurry or you can make and print ink jet or labels for a more professional look.