Ringed Taper Plug adapter but can be easily added

but can be easily added with items from our Do-It-Yourself section

diameter varies from 3-7mm

check out the forums at smartstim

diameter varies from 4-10mm

There is 1 small and 1 large ring in this set

Ringed Taper Plug adapter but can be easily addedPure Stainless Steel. Insertable length 120mm, diameter varies from 3 7mm. One picture has complete measurements, one is next to standard #2 pen for size perspective. Plugs are solid, sounds are hollow. NO electrical connection present on this model, but we do have them available or can be easily added with items from our Do It Yourself section. A small pad or gator clip is the simplest.