Bertech ESD Anti Fatigue Floor Mat Kit with a Heel Grounder and Grounding Cord, 4' Wide x 6' Long x 0.375" Thick, Gray (Made in USA) Made in USA RoHS Compliant Surface Resistivity: 10^9  10^10 ohms Designed to provide comfort and reduce worker's fatigue when used in a static sensitive environment Kit includes a heel grounder and grounding cord