LEGO Dark Stone Gray Power Functions Extension Wire 20cm (21669 / 60656)

LEGO Dark Stone Gray Power Functions Extension Wire 20cm has been used in at least 3 LEGO sets over the past 16 years, since it was first used in 2008. You can also find this part in at least 4 other colors. It has the design IDs 21669, 60656 which can usually be found molded into the bottom of the part.