The Desco 07590 Heel Foot Grounder, D-Ring Fastener, 1 Meg Resistor provides effective ESD protection. The cup is made from a black and non-marring rubber with inner tear resistant conductive scrim. The rubber is antistatic, low tribocharging, and dissipative. It removes charges when in contact with ESD protected floors. This foot grounder meets the less than 3.5 x 106 ohm requirement of ANSI ESD S20.20. This unit includes a one megohm molded external resistor, a conductive tab with carbon suffused fibers, and a D-ring fastening system. The product has been tested to ESD STM97.2 - Floor Materials and Footwear Voltage Measurement in Combination with a Person. It is a suitable ESD footwear component in Flooring - Footwear System when used as the primary grounding method.