This is the electrode set which can be purchased separately, but which is included in the colloidal silver generator. If you are a "do-it-yourself" type, you can, with a set of these and three 9V batteries, build your own colloidal silver generator. If your time is worth anything and/or you need tech support, however, the few dollars you save may not be worth the time and trouble. We also sell the pure .9999 fine silver wire by the foot for the real colloidal silver producer.