... 3.USA Gel,self gel tens electrodes(electrode pads,reusable electrode,self-adhesive electrode,massage electrode,tens electrode pads,ems pads,ems electrode,electrotherapy electrode,physiotherapy electrode,adhesive electrode pads,tens units)Size:40mm diametershape:roundSoft ... white and skin,also select the color customers wantPigtail and snap connection optionalsnap sizes :3.6/3.9mmWater base gel ...