Soft silicone cock ring set with lead wire. These round rings are both bi polar. and can be used separately or together. The black parts are conductive. The lead wire has a 2.5 mm jack plug which fits to our 3 different power box units ref. # 7850, # 7880 and # 7890 Make sure that you use enough contact gel to create the best contact with the skin. (Ref. # 3000)