Bertech Rubber ESD Soldering Mat Roll, 2' Wide x 10' Long, Blue RoHS Compliant Suitable for semiconductor/hard disk drive industry and other static controlled environments Surface Resistivity: Top Layer: 10^8 - 10^9 ohms, Bottom Layer: 10^5 - 10^6 ohms Made of Two Layer Rubber Material (Green Top and Black Bottom) Applications: Aerospace Assembly, Electronic Manufacturing, Electronic Repairs, Fiber Optics, Hospitals, Medical Assembly, and Soldering