I like that the grips I have use a "pin" that connects at the corners. Additional panels can easily be added. I don't like the ones with snap pages. It's molded plastic and the inside of the panels isn't solid/smooth and collects "dirt". But the panels are easy to disassemble and wash with a spray bottle. Durability? I have an aggressive toy poodle that chews on the door. She managed to slightly damage the slab, but did not go through it. Now she's sitting in a metal pen... and even chewing on it...
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