MEDI-TRACE 530 Series Foam EKG Adult High Aggressive Teardrop Electrode.  The 530 Series Electrodes Are Designed For Superior Performance Including Adult Stress, Holter and Diaphoretic Applications.  Utilizing a highly aggressive adhesive, the 530 electrode is appropriate for the most challenging of monitoring environments. The high quality foam substrate conforms easily to the skin to ensure electrical contact for consistent tracings. The patented conductive adhesive hydrogel provides additional adhesion, leaves no messy residue to clean up and is designed to stay fresh up to 30 days out of the package.