Accuform Signs® "NOTICE ALL VISITORS MUST REGISTER AT OFFICE" Black/Blue/White Do Not Enter and No Admittance Safety Sign measuring 7" X 10" is made of 0.04" thick aluminum that offers good chemical, abrasion and impact resistance. Sign is ideal for a wide variety of industrial strength applications and excellent for indoor as well as outdoor usage. Rounded corners safety sign is designed to resist splashes, wash-downs and outdoor environmental conditions. It is protected by UV resistant clear polyester and offers the strength of metal, yet never rusts. Sign is designed to identify areas that are to have no access granted to them.