There MUST have been a better way to design how these things clip in, GOOD LORD what a pain. They use these super tiny, rigid plastic, clip things around the perimeter. Its not the fault of these replacement pads, but just be forewarned that you'll have to go through it. The replacements themselves are fine, they work just like the originals and show no signs of wear 2 months later. For the cost, they're just right, and they fit fine/feel just as comfy as the originals.
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