Standard through-hole 1N4148 Diodes. These are generally needed when building a custom keyboard if the PCB does not already come fully assembled.
Comes is sets of 10 diodes.
Note: Be sure to remember you need to place diodes in a specific direction for them to work properly! Typically the black line on the diode will line up with either a white line on the PCB or the square diode pad, however please check documentation on your specific PCB to be sure.