If the dividers are inserted from the back they will remain permanent as they cannot be inserted from the front. The dividers are made of thin cardboard, a little thicker than a box of nasal wipes! It is not recommended to use the entire pack of paper on a shelf. I'll keep the rest in the closet and put 1/3 of the rest in the slot (if using new paper). I use 20# plain white paper, photo paper (for printing family photos), 24# resume paper (I make resumes for friends and family), I print brochures for my business, so I also use 32# glossy paper. Months later, the sides began to curve outwards, causing the dividers to fall off, and anything that was on the dividers fell off as well. So I permanently glued one of the separators (in the middle). Complete junk. I would not buy any more of this item. In fact, if someone gave me another one, I would return it. I ended up making my own homemade cage out of 12" pine. I made it 36" tall to accommodate LOTS of slots. I cut each groove (after measuring). "Levan") to craft shelves. I then created a plexiglass (acrylic) door to cover the front of this paper divider cabinet to keep dust out. I use a magnet to keep the door closed. The shelves stay in place when you pull the stack of paper out of each shelf because I installed pins in the extra 1/2 inch of each slot that release with needle nose pliers. .very quick shelf removal and shelf locking technology. The pins are made of pins. "Just take the pinhead.
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