If depth is something you want or being able to move the smooth ribbed shaft in and out of the urethral canal, this stainless steel insert may be of interest.  The total length is 9 inches, with a 7 inch section insertable.  We have three sizes; 6mm, 8mm and 10mm.  If you choose to go to the next level and electrify if, you can use some electrical shrink wrap placed over the 2 inch top section and secure a 6 inch cable to it to use with your power box lead.  It will, of course make it a single-pole electrode that will need to be used with another single pole electrode, such as a conductive silicone loop, TENS pad, prostate stimulator or any other single-pole electrode of your choosing.

We have the cables to electrify this insert in our Wiring and Adapter section of the web site.  You can get them in TENS or Banana sockets with the other end stripped back to place under the shrink wrap before applying heat to shrink it.