Made of thin (.06 inch) 2-ply rubber, the top (dark blue) layer is static dissipative, and the bottom (black) layer is conductive. Easy to cut into workstation mats for soldering (resists heat up to 500F), used as floor runner for assembly lines, or as a tray liner for holding electronics on racks these mats are widely used for anti static or electrostatic discharge (ESD) protection in a variety of workplaces. (See ‘Installing Snaps and Grounding Cables ‘ tab below for more info on additional products we sell to connect these mats to electrical outlets for grounding).