This is a standard i2c jumper cable designed to connect between modules that use the most common pin ordering for their i2c jacks (SDA-SCL-GND). It comes in two lengths (10cm and 20cm), has black shrink-wrapped ends, a hand-applied artisanal polarity marking, and an assortment of festive rainbow colors for the wires themselves.

Some modules that require this style of cable are: Teletype, Ansible, White Whale, Earthsea, TELEXi (TXi), TELEXo (TXo), and Just Friends.