DESC: 6 different size options available Comprised of flexible stainless steel fibers Provides excellent conductivity Very comfortable and durable electrodeDura-stick® II Carbon Film Self-Adhesive Electrodes are comprised of flexible stainless steel fibers which provide excellent conductivity. This combined with a thin carbon film and adhesive gel, make the Dura-Stick® II Electrodes very comfortable and durable. Reusable. Dura-stick® II Electrodes' flexible, yet sturdy construction offers increased durability and ease of removal.