Definitely for advanced electrical play. These catheters do not have to be inserted completely, just enough for good contact. A must for male auto ejaculation scenes. The catheters come in Small 1/8" diameter, Medium 3/16" diameter, and Large (not shown) 1/4" diameter. All catheters are unipolar.
If you want to know more about how to hook up these E stim plugs we have a book that we use when teaching classes on the subject of E stim. Click the button below and the booklet will open in another window.