I bought these a few months ago to replace an old gasket that was starting to fall apart after years of use. They were working fine until a few weeks ago one of them had a wrist rest issue. In particular, about 2 inches of the top left corner of the palm rest appears to be almost "deflated". For lack of a better term. I understand that the rest of the silicone does not contain air, so I suspect an air bubble was accidentally introduced during the manufacturing process. I've since swapped this mat for a laptop that hardly gets used anyway, so it doesn't bother me here on my desk. Despite this shortcoming, still decent mouse pads. Updated 07/24/21. I had to lower my rating as the second pad now not only started to compress with use but also started to pull apart along the seam at the bottom edge of the palm rest, exposing the sticky gel mucosa that they didn't have inside at all hard, hence both wrists collapse after a while of use. I cannot recommend them at all.
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