Seems strong and durable, well built, essentially hockey pucks with a ridge on top. I tested the fit of all 4 at each of the 4 jack points on my 2021 Tesla Model Y and they fit great. The silicone ring keeps them in place but makes them easy to remove. Toss them in the rear small cargo hold and don't expect to use them often, but it's good to have on hand when needed.
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