Totally customized, titanium hinged, locking discipline chastity collar, machined from solid titanium. In this configuration it is a completely rigid traditional discipline collar.
Remove the discipline shackle and posterior hinge, adding flexible links instead and the collar becomes a flexible necklace that hangs in a manner that might go all but unnoticed.
Just one more example of how SteelwerksExtreme can meet your unique exotic jewelry requirements.