Pure Stainless Steel. Two sizes available, regular and short.

Regular has an Insertable length of 80mm, short is 60mm. Diameter of both varies from 3-8mm. 

Comes with 2 rubber (not conductive) rings, choose which will fit best.  (25mm and 30mm)

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.