Looking for a flexible, comfortable, beaded bi-polar insert?  This may be the one.  The stainless steel smooth 4mm beads being 4 inches long, bend to the curvature of the penis as you snake its way down.  The top portion of the insert is straight and makes the second electrode to complete the circuit.  If look closely at the insert, there is a small plastic separator that keeps the first electrode (Beads) from the second electrode.

If you want a little larger diameter (5mm) insert, go back to the Urethral Insert page and look for this size.  

This insert uses a 2.5mm male audio pin that is plugged into the power box.  If you have a power box that uses a 3.5mm audio jack, you will need to get an adapter (3.5mm male to 2.5mm female).  You will find them here ====>> http://happystim-usa.com/catalog/i363.html.  If you have a TENS pin lead you may want to consider this adapter (TENS sockets to 2.5mm female adapter).  ====>> http://happystim-usa.com/catalog/i434.html.