This protoskin is a blank piece of PCB that can be used to prototype circuits that plug directly into the pyboard. The form factor of the protoskin is 'X-skin' which is exactly half the size of a pyboard. It fits in either the X position (bottom half) or Y position (top half).
This set of header pins can be soldered onto the MicroPython pyboard (all versions), and mate perfectly with both the LCD and Audio modules, as well as the Protoskins. The black pins are used for the standard I/O ports and the 4-way GND rail, and the white pins are used for the 4-way V+ rail and the additional, inner I/O ports.