Twelve 10Kohm resistors
Eight NPN transistors
Lots of small jumper wires
A Breadboard to assemble it on
That is it. Short list, huh? 10Kohm resistors are not essential.
What I mean by that is that you may substitute them for different resistors. Any combination of resistors with a value between 4.7 Kohms and 100 Kohms will work in this project.