What is a static cling label?

Heavily plasticized vinyl, typically 7 mills or thicker, is given a high static charge. When adhered to a smooth, clean surface (such as glass), the label adheres easily. Static cling labels are used for truck window decals or door labels. In that they do not use adhesives, they can be easily removed.
 
    
Static cling sign applied to the inside truck window.

Also see: Static Cling Parking permits