Bertech ESD Two Layer Rubber Mat Roll 3' Wide x 33' Long x 0.06" Thick, Blue ESD Safe: Designed for an electronic assembly where static charge is a concern RoHS Compliant Surface Resistivity: Top Layer: 10^8 - 10^9 ohms, Bottom Layer: 10^5 - 10^6 ohms Made of Two Layer Rubber Material (Blue Top and Black Bottom) Excellent resistance to oil, grease, and most common solvents