Bertech ESD Two Layer Rubber Mat Kits have two layers; the top one is a blue static dissipative rubber layer laminated to a black conductive rubber bottom layer. This ESD Two Layer Mat provides excellent resistance to oil, grease, and most common solvents. It is very light compared to our single layer and three layer mats. These mat kits include a mat, common point ground cord, and an adjustable fabric wrist strap. RoHS Compliant.