The Axelgaard UltraStim Snap Electrodes are specially designed for EMS and TENS applications. Capable of providing a smooth and even current distribution, each UltraStim Snap Electrode features a surrounding border that creates a deliberate current roll-off to prevent any edge stinging. Features Axelgaard UltraStim Snap Electrodes Features Proprietary silver grid patterns precisely controls the electrical current. Provide optimal comfort during use. Bottom snap is precisely matched with the system's impedance to ensure consistent current flow across the electrode surface. Configurations Axelgaard UltraStim Snap Electrodes Configurations #SN2040D: Dual - Rectangle [2" x 4" (5 cm x 10 cm)] (20 per Case). #SN2020: Single - Square [2" x 2" (5 cm x 5 cm)] (40 per Case). #SN2040: Single - Rectangle [2" x 4" (5 cm x 10 cm)] (40 per Case). Literature Axelgaard UltraStim Snap Electrodes Literature Axelgaard DermaFlow Gel Safety Data Sheet Axelgaard Electrode Care Tips Axelgaard Electrode Catalogue Axelgaard Electrode FAQ Sheet Axelgaard MultiStick Gel Safety Data Sheet Axelgaard UltraStim Snap Electrodes Statement of Sustainability EU Axelgaard UltraStim Snap Electrodes Statement of Sustainability