Pure Stainless Steel. Insertable for small is length is 55mm, diameter tapers from 15mm down to 10mm. Has a jewel decoration on the handle.
Medium is Length is 83mm, diameter 3.2mm.
One picture has complete measurements and one is next to standard #2 pen for size perspective.
NO electrical connection present, but can be easily added with items from our Do-It-Yourself section. A small pad or gator clip is the simplest. For other how-to ideas and instructions, check out the forums at smartstim.com.