MACTAPE Safety labels are made of weather resistant materials, commonly used polyester and special materials, used to identify dangerous areas or items, to remind people to pay attention to safety. This kind of product has good durability and wear resistance.These labels are UL969/CSA certified for outdoor durabilityhttps://www.maclabels.com/What-Is-A-3M-Label-A-Comprehensive-Guide-To-Industrial-Grade-Labeling-Solutions-id48631606.html