The Santamedical Unit White Cloth series of electrode pads are high quality.These TENS Unit Electrodes are professional quality and very popular with Healthcare practitioners for in-house use with their professional electrotherapy devices. They also make a preferred choice for personal use TENS Unit. These TENS Electrodes offers the highest quality of reusable gel on the market. Since the Electrode Pads are pre-gelled, simply place them on the area, and when finished, place them back on the electrode pad (included). The better you care for the electrodes, the longer they will last.