The PlayMakar(R) Sport Electrodes are intended for muscle stimulation with your PlayMakar(R) Sport Wired Muscle Stimulator, model PRO-500. These premium grade electrode pads feature excellent dispersion and conductivity. With multi-layer adhesive technology, these pads provide optimal bonding to the skin for a more comfortable and effective muscle stimulation experience. Features Premium grade electrode pads Offers excellent dispersion and conductivity No conductive gel required Multi-layer adhesive technology Flexible fabric layer contours to your body Package Includes: Total of 12 pads 4 Large 2"x4" 8 Small 2"x2"