"Do Not Disturb" Sign By SmartSign | 7" x 10" Magnetic DURABLE. Labels are made by embedding magnetic ferrite particles into the 32 mil thick synthetic rubber base. Labels last 2+ years outside. LAMINATED. Labels come with a clear polyester laminate that resists fading, cracking and chipping. INSTALLATION. Labels stick to most steel or ferrous metal surfaces, and can also stick to curved surfaces. They can be cleanly removed and reused.