These are one of a kind earrings featuring two bridge rectifiers and nickel-plated steel spring rings. The ear wires are surgical stainless steel. A diode bridge is an arrangement of four (or more) diodes in a bridge circuit configuration that provides the same polarity of output for either polarity of input. When used in its most common application, for conversion of an alternating current (AC) input into direct current a (DC) output, it is known as a bridge rectifier. [via] They come packaged in a real, translucent gray zippered anti-static bag on anti-static foam, sealed with an "Authentic" tamper-evident holographic sticker. 3" drop, 1"wide.