At first glance they appear to be identical in size and construction to the original filter, but the sidewalls are much stiffer than those in real filters, the are flexible enough to easily fit into a tight foot space. Since the sidewalls don't flex as much, these filters are much more difficult to fit and you actually have to flex them a bit to fit them. Once in place and fully installed, they're great. Installed on X1 2017.
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