These two Stacking Headers alone are, well, lonely. But pair them with the Raspberry Pi Pico, and you're in business!

What do they do? They stack. Put the headers through your Pico and then you can not only plug them into a solderless breadboard or perma-proto, but you could attach circuitry on top as well. If you want the Pico up top for access to the boot button, you can put these headers through some add-on circuitry like a PiCowbell so that the boards can still plug into to a breadboard.

Note: Kit includes two 20-pin stacking header.  Pico not included.