Designed to provide permanent identification for your surveys. PERMAMARKS are made of high quality polyethylene and will stand up to temperatures ranging from -40 to 150+F. The markers stand up to environmental factors such as weather, acids, salts, minerals, smog, and other chemicals. Easy to install and ready to personalize with your PLS, PE, RLS, company name or other information you request at no additional charge. Fill out the rebar cap form today.