Simple, solid and sexily no-nonsense, the Collar is made entirely of stainless steel, which, as you'll know if you've played with steel before, is extra sensitive to temperature. Warm it up or cool it down beforehand for feverish heat or a tingly chill. 

A perfect circle, the thin, weighty Collar loops fully around your/their neck and locks VERY securely into place with a special mechanism that requires an included allen key to lock/unlock. At the front end, there's a steel O ring connected with some limited up/down movement. Use it to attach a leash, or connect up with any bondage gear you own and love.