Micropore tape backing is breathable, flexible and conformable, yet is gentle to the skin for increased patient comfort. Patented solid gel conforms to the skin quickly allowing high quality, uninterrupted traces. The gel's low chloride content minimizes skin irritation for increased patient comfort. Provides good performance for up to 30 days out of the bag. Use of built-in abrader disc improves trace quality for better results (only on 2249).