Conductive gel makes it easier to transmit electrical impulses. This refill pack can be used for any device that requires conductive gel (also called connectivity gel), such as the Sleep Improving Wrist Band (Item No. 201491) or electrolysis devices such as the Fine Facial Hair Remover (Item No. 100871) and LED Home Electrolysis Kit (Item No. 201622). This refill pack includes 3 tubes, and each tube contains 20ml of conductive gel, for a total of 60ml (2 oz.).