I installed them on a set of studs I bought a few months ago. I've done a few rides and put them on over 3800 miles and they're holding up great. The fit and finish are still the same as the day I installed them. If you have a European car and are upgrading to spikes (and need this type of seat), be sure to check this out. They are a bit longer than in the photo but in my case they had to be big enough to accommodate the longer studs.
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