Over the past 19 years electrode configuration has evolved.

"Series" indicates what sort of electrodes your "SilverPuppy" generator uses.

"Series 2":  12 gauge wire, 7" total length, bent into U shape and adapated with Brass Ferrule to 2.5mm diameter to fit tight in the electrodes sockets. [as shown in photo]  [up to 1/1/2015] 

 Specs for  all:

.9999 Fine Solid Silver

price is for a pair.