Dura-Stick II 2.75" x 5" Rectangle 40 PackDura Stick II Self Adhesive 2. 75" x 5" Rectangle Electrodes 40 case The Dura Stick II Self Adhesive Electrodes conduct electrons from the electrotherapy device into the patient and serve as a conductor and medium between the two. This product is available in round, square, and rectangle shapes as well as various sizes for specific treatment types. 10 packs of 4 electrodes each