This is only my second insertible electrode from E-Stim Systems and it won't be my last. The large Torpedo is heavy with sturdy construction and excellent craftsmanship. The low profile leads connect very securely and it conducts electricity well. I power it with an ErosTek 312b. The smaller "neck" (the black connector between the two electrodes) is perfectly sized for my anatomy to keep it in place during long sessions. The grooved base is also a nice feature to ensure a good grip during insertion and removal. The shipping to California in the U.S. was fast. So, an excellent product that I expect to enjoy for many years to come. Thank you E-Stim Systems!