Use with shoes where heel grounders are impractical. Premium grade conductive rubber is highly abrasion and wear resistant. Will not mark shoes. Stretch velcro for comfort. 10" conductive tab. Adjustable at heel and toe. Specs: RTG: <2 x 10⁶ to 1 x 10⁷ Ω/sq.; Material: Two-layer rubber; Cup: 1-1/2" x 7-1/2". (USA) 1MΩ Resistor.