It seems that the cores of the spikes there are only 3 millimeters long, although I drove carefully (a 4-wheel drive car), there are almost no slippages. I rolled the spikes for thousands of 3 km. , I lost 2 spikes during the whole winter. I can’t put it on next season, although the tires are still like new. Verdict, I won’t buy such a model anymore. Pros below: It holds well on ice, does not make noise, for 20t. Km there is practically no wear of the rubber itself and does not harden in the cold. Some cons: And now about the minus that crossed out all the advantages of this tire. After the indicated run, the cores of the spikes began to actively fall out (the body of the core itself remains in rubber).