Cardinal Health Kendall Medi-Trace™ 230 Series Foam EKG Electrodes (31078135) - MEDI-TRACE 230 series electrodes are a cost effective general adult monitoring electrode. The foam substrate repels fluids and conforms to body contours and a smaller footprint for convenient lead placement and a tear-drop shape for easy removal from the patient. Stays fresh up to 45 days out of the package. Solid gel adhesive. Size: 1-1/2" Diameter teardrop. 30/BG, 20BG/CS. Price per Bag.