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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@jeffmer
The sockets are actually for IC pins and the last place I bought something similar was from Mechboards .
The usual breadboard jumper wires are too thick for these sockets and I am afraid I have no idea where the ones in the picture came from.