This is a really hot-yet-subtle necklace with a raw, industrial feel. Segments of wire-insulation-type material (black rubber tubing) are interconnected via genuine screw-end wire terminals. The rubber segments easily wrap around the neck for a fitted look, and the stretchy rubber provides comfortable wearability. The size is adjustable between 12" and 13.5" and the sizing chain terminates with a real 3-amp diode, making it easy to put on, and adds a distinctive sensibility.