If you are looking for not just an excellent bipolar E-Stim electrode, but also also something that is going to feel substantial once inserted then the Torpedo will fit your needs.
Designed so most of the mass is in the head, the small torpedo is ideal for those seeking a 'full' electro experience, but just cannot cope with the large version.

Unlike most other E-Stim electrodes on the market today the contact points are top and bottom rather than side to side, providing a more natural feeling action when the electrode moves.

Dimentions

Length:  13.0cm     
Head Diameter:  3.8cm     
Weight:  334g

Connections

Dual 4mm sockets in base