X-9 manganese, 9 mm slim fit cable linksSpecific for cars with limited gap between tireand mechanical partsManganese steel for extra wear and tear resistance.Self-tensioning system. After the installation and the first manual tensioning, the chains tighten automatically while driving. No more stops for tensioning.Automatic release function. New trigger mechanism for a quick and easy releaseApproved TÜV AUSTRIA – ÖNORM V 5117 GEPRÜFT.